Malicious PDF — malware analysis report

Static analysis result for SHA-256 b344fbc4162e281f…

MALICIOUS

PDF

81.3 KB Created: 2021-08-26 01:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea0985e147de59a753bd51740f7f5d80 SHA-1: 9f8ec386ff40486132d64ac0f7a53ea29a19f9f4 SHA-256: b344fbc4162e281f16073d3cb5c5c106af8d9192577e2cd8f4731e0e79f1d914
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://huntic.ru/uplcv?utm_term=typical+apr+for+car+loan PDF link annotation
    • http://broadgatecapital.com/userfiles/file/kulegojopatemuzore.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zopadokotifeso.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/27229bf85b8e9dea695ae99ed2acb5a0/xakununebunogibi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/54212794465.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18383d5da4---37963393948.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/39723030621.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mawaruxazowatexilafin.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/59707682242.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/fisafedodapi.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pumunuwogebonapasexufab.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eir3v494jhhfbkr3a0tse4so13/lidobotabazida.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6b130dbdddbca6e275cfcd6a692d1204/fifuzivazepezeletofulufa.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/74204592958.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ca59d281730a238db7d68c97ba4c7fc5/xerezolomuxa.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/26220218169.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ab00aafcb---28951741579.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/5645015713.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9dd76527---bumifarudufobonanal.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02a57a77f---tuxirulasigusagerogevevuf.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41899833566.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/14692869296.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/15538145665.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 10152 bytes
SHA-256: ba559d710ec00e529deeb66b3fc3106d23ec830233ad7728b62039282f323df2
font_01_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16740 bytes
SHA-256: f52d0927f3fbaa99fd35261614693f3ee510397d68ee3a46e49d868da5456c21

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