Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3611ab301c65cae…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 02:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6140407440341c9d83bb9919c83a915 SHA-1: f699fa9873eb74b2c09df7bdb12952d040b6c7d2 SHA-256: b3611ab301c65caef64513b42a2822733b72296724dc72e676c68f516ebb12c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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://accuratesearch.com/userfiles/file/dalup.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/eacdjabdtd0vt4mn2el4qla567/newugipowaruvuk.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/ganedi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/28529236295.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200e511f7---dafobixidomorelazix.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/69835575655.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/59318927574.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/15566425838.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vumokijufuxumajuna.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6d4b9bc6---botuxemeg.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/tenijujumuwenorewukin.pdfIn PDF document text
    • http://jucal.es/images/file/wogufutugedezevazeled.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d7a98b81---pejixa.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/90727903849.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/22976427070.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vowokeferiwol.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/04khl3j080c4k27vg94jif5upi/pakimedilozunisizipiwe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad27ce876---84190922662.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/24803774787.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/9378414940.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/82325687747.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/vekagux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=being+on+a+missionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10260 bytes
SHA-256: 7b679faf294eab7b0e5d51344719b3752f001b7ee7fcedbe20b77f07c097c908
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 17596 bytes
SHA-256: a990c8518bed5b17fff387aed8a1f9a7595d88b0a797e2867c189ddfeece3e1c
font_02_sfnt_off00013f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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