Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1fb3ad6940e021…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 12:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eaf642f7a4ea6ce6f91de8d762be3c4d SHA-1: 3be31bea8f463adfce6a8b0be0a1ed003b03bd03 SHA-256: 1a1fb3ad6940e0214c1782a83b1f7b2f58c1bcd8c9ff7cb7565f6efda507e1d7
176 Risk Score

Malware Insights

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

The PDF file is identified as a phishing lure due to its structure, containing only an image and a clickable action, typical of a screenshot-based phishing attack. It hosts a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://krisoc.ru/uplcv?utm_term=how+to+fix+invalid+mmi+code+on+android PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ec283125400ffde9d70126fdb6d75392/fefibezomo.pdfIn PDF document text
    • https://swiz.eu/files/editor/futadawudonafidud.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/gitefokejujewa.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/70098781987.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/27005880402.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae9fa4331---76617779681.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litugiguloluban.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/mefotez.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/68962938642.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zidinogeperonu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3433ffca12015d8cf9864bf2e4331781/29104902301.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/99808716801.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/lanobu.pdfIn PDF document text
    • http://geoman.cz/data/file/81268952578.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sugevipuwip.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/wagivalavubeminonu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gezukoragune.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pobojobugagipejes.pdfIn PDF document text
    • https://ferropula.hr/files/53846147973.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/25630159789.pdfIn PDF document text
    • https://shevian.com/images/file/wawujuke.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_off0000b0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EB 10716 bytes
SHA-256: 299f8cd8a530ccf8ccf202daf80fd9bb0178eb78c04b4a0bc20974375065713a
font_01_sfnt_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 14140 bytes
SHA-256: b12bad1861626f5a07d3a535d59955f0db3b03021ed58777af673fff7005e474
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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