Malicious PDF — malware analysis report

Static analysis result for SHA-256 870a608295bbdc3c…

MALICIOUS

PDF

87.2 KB Created: 2021-07-15 13:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 701c536d18a95fa5e8e81abbc6fed040 SHA-1: 6b1eebf3cd644ea06f2a0125b7d89862d1bbd1af SHA-256: 870a608295bbdc3c1dac18138ee335c844e290c0707095d0b7e6969b3c9229e1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and the nature of the URLs strongly suggest a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vegas-shop.net/uploads/files/91355229878.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/70c63beef9ac2c2d79f2dae49b2d16ed/32856603435.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47b9b4cd8---11122914837.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/648aeb4d8056edc4e6d1295780c11cd8/83427730412.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6023096875.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf84f158---98478572374.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/dosedavijazutesolatuzut.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c77d975c365a991dd61a57d48c81470/wokezup.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/goxake.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210618164340.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607563d3e4e64---80712531813.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d18494bbc---4325584472.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3bc5637339465fe4b108ad33522738de/kevobuxor.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dfe2e58871a62447e34231b11c08f957/mojumogunaralubutona.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dd23d53dfb39eb6bc1b63499f394490f/75472091476.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/22158887641.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/85501602438.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/85618311759.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/62d779fcc050360b972f73132bc8a849/26306943961.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8v000o3qapkh3l5b3mr12dq12e/bijizodagonovo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d2988080099---42858640057.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd47dd953---vegatinakipofavomelenazaw.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/65733734068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mother+teresa+the+untold+story+pdfPDF link annotation
    • 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_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10708 bytes
SHA-256: f08bafa828ef7295747e069820e78cb26457962b3125031b8a0b13e579132937
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 17004 bytes
SHA-256: 3e67abda646a4f0e0000cb829f00bd06d31a04b677828e47f7d7934d945bc924
font_02_sfnt_off000144c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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