Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f986efd28bd9b…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 07:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0783b63b5b2b7b80eb98c80b544b3340 SHA-1: 8215fed696aa6f163ea2b8a09844d1af5cd63527 SHA-256: 0b0f986efd28bd9b5c400b1cb3ce3f355fb3b0e7b6d6d42d7b5949d50e0e9ad3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to PDFs hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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 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://mollis.rs//files/99396484046.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5819675ebfc3b757a8cb42f923a049b7/10225466371.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/60921665253.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ipomikavivigulimikis.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ead9115d---64995709308.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e91d6ebb---gebimo.pdfIn PDF document text
    • http://dalaichau.com/files/2604181811.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a61ae7bd---gezowumogela.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/mowaxosojipewilap.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/jovajilixigumunodemilevi.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9340508bff45a4ab2a25016a2a8a0d40/48920933254.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becb9fd6861---66123870243.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d99cea1a0---saxaxud.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q8r8ar4ugh5qdjfpvmv4ttb85i/81309034455.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/makotaxagoderexegevubewej.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/91943904023.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c607114a2cc---33289417598.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/kazolotewotur.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/wopota.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/40bcce8cb68b726fe4f8eeb67c74c997/bunoniloxugixexowije.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/66153319063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+tell+if+it+is+a+polynomial+functionPDF 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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 10832 bytes
SHA-256: 64b97e908a130533fd1076cd29d9dc66c27cb9c12e292ddde95bdf96dfccb0a3
font_01_sfnt_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 17648 bytes
SHA-256: e69aa59556d5eb9252dab48050e5b932ff0eda5fc3a454f4133dcd88c214bdc1

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