Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e649266e4bdf9d…

MALICIOUS

PDF

103.6 KB Created: 2021-09-17 20:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82b39eba104a97ec246d5cb5944e0c84 SHA-1: bfffff22098183cc15903faa63db4fa318faf667 SHA-256: 41e649266e4bdf9d71a76f6490806a75ef079002e965498699103ecf6f691791
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including links to compromised WordPress upload storage, suggest a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=convert+milliseconds+to+date+android PDF link annotation
    • http://imaginove.eu/data/Files/wedesofokowiliji.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/80321961555.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137525c74d78---66909223957.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/peguxudupoje.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/23838768512.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44247aeb21ba919a26f6814f1180fd92/wiwewejanel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/konaketokogad.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/raxejadi.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/desojijixowodasub.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/vizopunikapul.pdfIn PDF document text
    • https://mbbs.hr/files/nitowurazomase.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gipebedizonivap.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/lipagoguramevesibilowuxuw.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914130307381.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/44648120260.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/bijegomovokerejab.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pufujatadajozij.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613918b6d60a5---kituzewixiwamefegimarubu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/nafenibofusanik.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/gexulaboperizovizujaz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/86456076495.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/55170929100.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/41557388625.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_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 10628 bytes
SHA-256: f86cbcd377b9f6fda680bde480862314e4e0e6658064815e43fa5ebeb1ef9ae2
font_01_sfnt_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 18392 bytes
SHA-256: 2db2c67dc2a096dea898f92b070b01e61d09af7908bc1f8e480996323f7f8e2e
font_02_sfnt_off00017803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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