Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8bab8fe99839a6…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 04:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6da8ada203d237c57c61c4f3172d077 SHA-1: ac3cd98e7de18dacfd8ee4b1971ff77c17d3426b SHA-256: cc8bab8fe99839a6d18e996e0a7514af1bb800020c5c945756a67719892b9519
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The file's structure and numerous external links suggest it's part of a campaign to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ae6b6971---13523660961.pdf In PDF document text
    • https://imotrading.com/images/userfiles/70778698898.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bdd96be6c8d811227f8c19c16028b9f1/degelodabobukanig.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/9096383704.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2d9a6a84---38804028582.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/retupanixagokikoturob.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082baf60b0d1---9084970317.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e6a8c92943ff6eb6b2580f03289703c8/88069128518.pdfIn PDF document text
    • http://strandedtattoo.net/file/9884377819.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mqs1a5lafq45v7ht8o171p7eij/wifewijebelodujeba.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e65458bb1dec874f02db1fbb470d4c66/vonimi.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pinasadiwepek.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/91264925799.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/60113344508.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/bikadirekatalijadabekaw.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d34e0c83ff97a6c4c5f0a2dbbdea55ed/warazisuzesow.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/debaxeti.pdfIn PDF document text
    • http://rayanchem.com/d/files/95696218266.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/38661183990.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/63381048553.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc2lgpav950s0p2ifku8nfvgg3/mesafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=french+onion+gratineePDF 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_off0000c68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 18580 bytes
SHA-256: 5eb3a34b01a977ccf5aed0fa4693757a6f1cd7721f85062f5a427af5ae38a17c
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10272 bytes
SHA-256: 3ef4534f1f84adef1c5ffeeacaae231cc70f8f4d238d14ae54ae8f62f49bc8a0

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