Malicious PDF — malware analysis report

Static analysis result for SHA-256 335253f7a96f9dc5…

MALICIOUS

PDF

89.0 KB Created: 2021-07-17 02:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d76043d86fce453061d1135e29c6f8c SHA-1: 002532ecdefae59bbd98338392f59394e0cfcbb8 SHA-256: 335253f7a96f9dc5a33e119134d09a349d55c02b4096641c31c156a80f146d0b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f830fb17005a8621587c0561a4693844/lerexigos.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eed76e533---86907918818.pdf
    • https://an-professional.ru/img/files/file/xivuxafamunelaponigokej.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cedb0b826ed6f746e7285c926565f74c/fotapimunaviri.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69be2f3951---92562037944.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25ab2f21afa5042862d87ea18b5e867a/judovijoxukivufujokuw.pdf
    • http://edelstar-mos.ru/files/mononapojaba.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4663561c3aa11ddbdc088f9c6746f13e/47425520997.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r5483uu487mcfnfllha1h6dn9k/lokulivisafa.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/22259409723.pdf
    • https://whitesal.com/data/images/file/1461_20210611001248.pdf
    • http://blevy.com/ckfinder/userfiles/files/tolituxuji.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/26237800797.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c4f3cab6e03b07292a5c00d80ec8c879/87068031978.pdf
    • https://landbar.com/upload/files/78924361560.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160e775fde2a68---71654543487.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3ef0d5703335de3113d6dc76d5919d64/20055937226.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b98d50d999d65cabd6a4793fd78e2203/ronenezuzixebo.pdf
    • https://ltssinternational.com/res/wysiwyg/file/somon.pdf
    • https://study4student.com/cache/fck_files/file/74431364775.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cbse+class+9+geography+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin
e40c6e46ffdde5b971010ebf26d1b14588f81b0c118957d6d8528530a3f5fa23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 17456 bytes
font_01_sfnt_off0001256f.bin
eb02da58cfd50cc53dd2c8f1ef471a67e86367b8dd0df29d4f6134ec1232a4e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 11016 bytes
font_02_sfnt_off00013eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 16792 bytes