Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78c2a4d035dd5f6…

MALICIOUS

PDF

84.3 KB Created: 2021-08-08 05:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02f3ecbc6f6e55ffa3c160b04bf1c4e5 SHA-1: b353fefab447f21fd1c95300939616673d92be80 SHA-256: a78c2a4d035dd5f6ae535b168c7cf1e0e1b1afd3953ba225b8040bbe6ad74a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve to distribute further malware or lead users to phishing pages.

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://smidgel.ru/uplcv?utm_term=how+to+paste+commands+in+minecraft+pe+ios PDF link annotation
    • http://studiobaliva.eu/userfiles/files/vixesubejonik.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/35312321335.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/35689111094.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0v92jja5q3341a7vgc92j8tc23/judesi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/66f9e1ca9dc28fa8217be2e9b80285e3/pigazutolowo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45049364345.pdfIn PDF document text
    • http://ashioke.com/images/library/File/39994162633.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lixixopovi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7853dac18---70605245659.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/lifezu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/31034739044.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210529103754.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/80643365803.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1543a6099ee9f078501aed1c321c88b2/84512202341.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ludamowedutobidixijamepim.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608722c58e91c---rutegererapanaboban.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210716_1BBB4E76159CEDD7.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/af1d52122dd230b2031ca13964747827/44299372385.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/32a2fe668a9d0e76c12329e669b25b6e/65723927454.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/99f11ded621403395c19e7056ee04c9a/83105033818.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/o04m4gg68tk1m472csu4ke8fl4/60943803064.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/87365614978.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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10812 bytes
SHA-256: 7ce4cc59baea0565da2429cf31812facd2990963eefd0e319833497747b74e74
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 18372 bytes
SHA-256: 85442d6df5d24f01526fbe2847ea69044ed736ef532003eab56a0f4493fe2ffc
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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