Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80c242fa1ba763…

MALICIOUS

PDF

87.7 KB Created: 2021-08-17 05:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b50803154f3b6067a36ff7012fe90869 SHA-1: 5806e9e834e8acbebbdee153cacfa87a50332c5b SHA-256: 8e80c242fa1ba763ff7c90e79be63b9b4f6305def99dfb58b2ad1f1fd13eec62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://fritz-fahrlaender.ch/download/ranikibo.pdf In PDF document text
    • http://nanumed.ro/uploads/files/58972926452.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1cde574d309799582bb9c5b161f4810e/40540476687.pdfIn PDF document text
    • http://3q1p.com/upload/file/210701112058633688wcpni073wmeh.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce28c5380---23719189231.pdfIn PDF document text
    • http://zatacorp.com/upload/files/valafojexo.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/gepeleduxokamumafobi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f60ebf1e---85790936603.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/73f36f61dc1f3ad5c4219f7365792ab2/wowukurelamoli.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/210fbf37462e8d76d4c8b1b9f2389aa8/82031849717.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/99657437649.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mobopixatetivugapukow.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051915072973499.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/gapavizavu.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/78756793292.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8vsnhl8emvfkag6i5qgvs8tjv2/89219625778.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/28804109005.pdfIn PDF document text
    • http://kfbi.ru/content/file/rinatotuxitibesubevi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83376c06b9---fisatas.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/7bdcf71bba8831cd3171eba68c35e99b/54377856114.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b6rdk6jgk8sk6o448rh8t9pg22/72017030334.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99370922414.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/kujidizemavinejaxemefe.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622745510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+you+use+your+tesco+clubcard+onlinePDF 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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17656 bytes
SHA-256: b1c387807e0a08a0c586a3b219529e52d522041c60568134ab8b8cb84fc60cbe
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 10748 bytes
SHA-256: 2648e29e8e632498cf916442de79f9f5d7cd6b62d1104b9074ec87e1fa3a167c
font_02_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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