Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f2c7593c9ef225…

MALICIOUS

PDF

80.3 KB Created: 2021-08-22 06:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b61e3517c8c0f6f5bb247b8513a50d0 SHA-1: 914f63e3df63c30744c5eed0513941bb2cc4262d SHA-256: 88f2c7593c9ef225568e65ad980dc9134bcf21a9eb2bcad08aec20821cb9dc42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=teledeclaration+fiche+de+police+maroc PDF link annotation
    • http://phuocthuan.vn/images/pic/file/56700896682.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ddc78bc38f7a6adeb0e623cb597f2a34/lilabegiwuku.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce3c75e9e---70756453385.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/59261837797.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pf7lqom0uug7uch26pnb6os0ki/geremolipiditivepob.pdfIn PDF document text
    • https://pmms-online.com/assets/file/bapakowiliwejini.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/pabegig.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b79cbaa61127979aa0b9489a47662872/falawuwunufovexalunobovit.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/gametiluk.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa7170fab6---11821112424.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/valowisa.pdfIn PDF document text
    • http://progetec.org/userfiles/files/dunadomulogomevifojel.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/somomuxemikuneg.pdfIn PDF document text
    • https://ranagro.com/files/63980919891.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/jekelige.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/tevesupisosojotevoruwagif.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/96988196658.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/af2e9dc2fd03e16d4d48fb38c4bd8c28/93212158075.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb5de9bde---lewujaloxapijow.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/99728573142.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/71919983028.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9b5c4cc0a092751db94913496832b54c/98678763154.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/14881172698.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/jazaniwanebolabun.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/zitakovinawu.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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 17752 bytes
SHA-256: ef5fd42f191f4d88c4240282084d8ff39f2260bb5dcae41cf3fc319a9e2bc67d
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 10680 bytes
SHA-256: d135f4163b1673d0d884e7ab3212b5896074fa3cba419bec7843fb3a499edf55

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