Malicious PDF — malware analysis report

Static analysis result for SHA-256 b875c0933e363140…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 10:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90f7f6729aca0d7c892ff66a9b57b463 SHA-1: 56545541389f3b49e1db5a36b3557d88f891dd72 SHA-256: b875c0933e3631404a17a6eb0a7e376f4a3dfc3a713798613ac412c0af9d7b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. ClamAV and ML heuristics strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/698gif1648ja47bcc4k0n2be93/vedudiwifiximo.pdf In PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/59461539768.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310196a79f4---88363154450.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/93815424619.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/mojilirinubegiko.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/fesenefupitifisaveti.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/58683364552.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/15956067955.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3badd2824---gudozabemimowupijuvoti.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/686ef2d1446f22ce28baa5e752732a65/xeximenik.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/sogojabipegibinebuf.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/8507828378.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413e9f46656---pajaniguvikewosijapov.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bedupefebotifetusiluj.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/zavenegujegazabuve.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/87716305997.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bekonod.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8b6b3bff---58358549589.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zadebofer.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/94804835023.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/25216031673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ask+jeeves+app+for+androidPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 16444 bytes
SHA-256: a9361505cf2390446b94795157a128a79d14e5cd29c55a6109509d95b1ef6859
font_01_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10616 bytes
SHA-256: 00f3a8e92cdfa3fa850d339e4ac83df36afc5e7df60ef20e5e66dae73e09ae5d
font_02_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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