Malicious PDF — malware analysis report

Static analysis result for SHA-256 267b7831c3446ef4…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 11:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc54542b6f80f5458b587b0bf5b8af53 SHA-1: 1d2959dcd80238da5eb72077ad8cd2b5433af2eb SHA-256: 267b7831c3446ef42550986745d647da4894e1dac0dc9c7306d39f0280273888
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it's part of a phishing or scam campaign. The heuristic 'SE_CALLBACK_LURE' strongly indicates a callback phishing attempt where the user is prompted to call a number. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://altsovmun.ru/userfiles/file/kidegiwuvesevizerefuda.pdf In PDF document text
    • http://bagliodeimille.it/userfiles/files/57027356975.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfc4483018---guzovevigemuwetul.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/27588159598.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/fipapixelore.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15998455713.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090116093184.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/zawamesuzapafesa.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12071710847.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-12-18-52-24-52.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/83512299330.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/moxipowodo.pdfIn PDF document text
    • http://nineslash.com/user_file/file/73343312124.pdfIn PDF document text
    • http://futboltotal.net/images/files/giwomavopaluroruwe.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/fomawar.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/63674353135.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/94579164618.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/160kd1n6cmv8h4a0p7rk68v0m7/zonedodesatolafed.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/nutibavexis.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489183e5623---10861402109.pdfIn PDF document text
    • http://ombs.ru/uploads/files/75098462695.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22588fc23---36229155098.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/61307541488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=promo+code+2020+robuxPDF 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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16600 bytes
SHA-256: ee73d0b1fd221c3cc49679448f19148d99a238a45e7f53913104032a3764737a
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10448 bytes
SHA-256: 8eb0c6c2ab211f6adc8c75c880ca706378b1f59c6ba316c7d1394dbea0974c37

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