Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fb2dd3dec6265…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 17:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de5efed3dd06cced99cf6f727bf59a4b SHA-1: ba3f8dd216ae15b2a970fb514bf83512eeb7bdb4 SHA-256: bf8fb2dd3dec6265693c34079df5967c8f35531dd721c8bc3c97ab86c7d23291
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for SEO poisoning or phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in tech support scams. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall pattern points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://an-professional.ru/img/files/file/13978103111.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ednfdmhjqtaak9tcdjpg68phi4/tebetovaneva.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/27070102274.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/17301636173.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39e19d539---4346122690.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/23156133067.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jadufijuzi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148eddbdf648---19411920308.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/83639937692.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/nafozuxozevafugovivunut.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/82253181553.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/rezojepofizorugibim.pdfIn PDF document text
    • https://comlosumare.ro/userfiles/file/15974954857.pdfIn PDF document text
    • http://sun-eko.eu/files/file/desusisifutisepu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/98734696270.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17f7efbd0be83f3f7afa2595a46f2b53/8675776656.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/83142262828.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/poboxepejobetolipilokat.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1f44b11a---woxotebabiverekukevajeju.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/31883126035.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34458103956.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/35568513107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fifa+2020+app+downloadPDF 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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 10300 bytes
SHA-256: 33837d3e8c1f20081fc8220138af69728a17995e925d47fbd3aa36db316feb3f
font_01_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 14908 bytes
SHA-256: 46f8b1a22950c91c8bd28b2e829c7c0a0aa769b7ad96816f0f35ab44646125d5
font_02_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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