Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3f0538d8ebfbd5…

MALICIOUS

PDF

100.0 KB Created: 2021-08-12 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aebc4889b660bbf4a4635e0c7b80862f SHA-1: c0b411b0ba9e238bf7464ef81c50001a70a4d43e SHA-256: 0b3f0538d8ebfbd562475644dc1dc42cf6c9aab4847a81917d9af0602ec80555
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The presence of a PDF_RANDOM_URL_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ikve1mivof48v6ljpbraq6qa83/feraragixazamapivexovoba.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ff5e0fee26d0e1008e9dc269a3e09c82/94696997509.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/gifutelixis.pdfIn PDF document text
    • https://andhimazhai.com/images/files/14981437403.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wujifotonefejibigewuluf.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a959ce261d0bb0e186cb1fcb498731e2/44365772246.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88147074069.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2d4dc656---41182832003.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/nulufufesonaxosupexobitaj.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/66220978205.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f42c26a4cf6---303993989.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/36660533701.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/68013567590.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/subugarumatagofofidezidop.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e0b3983823b81ee72c251d5806365cae/52278506924.pdfIn PDF document text
    • https://maisonforville.be/documents/file/basobu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/89773451760.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aab551d5694fdf0af1c5d2a076609a35/54750116930.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2sm5ff50jc0k7fd9erfsbukj04/xabivosorukipadez.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/f8esf9se68mjeeaif6u5o2o4n7/reruzaforuvesit.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mitabetixovegige.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/96005710728.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/27003385709.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/45decc4e2459996c26e5ee65b983869f/fumenoruxidavoju.pdfIn PDF document text
    • http://cecev.com/stockages/files/xosarifabejovasunexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+best+dex+weapon+in+dark+soulsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 17400 bytes
SHA-256: 177ef86367b9851cbece39d63d1469f414a529c2191f5f0e4a0400da6d974426
font_01_sfnt_off00014619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_02_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16640 11004 bytes
SHA-256: cad05e59a59a5e5caca085f938bef906e1a308867fdd7957e3c424a43048079b

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