Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a7039529b7e653…

MALICIOUS

PDF

90.8 KB Created: 2021-07-18 09:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f78710539dbe318e9d34b7716eea9b35 SHA-1: 78f7f3263c25af2b1fa1da33c3639f2b29b0cb54 SHA-256: 13a7039529b7e6530a3500540ea28f93c5f9f41f6cebd6dd75f4d2897843e32c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762d19a7705---xizezaviragazikolakimo.pdf
    • http://techhssilverbuffs.com/clients/61416/File/donofib.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0068b0be1---zizezeravogi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160989abb21344---bujapanivofa.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e20c51267---todow.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/i5i0av5bihb1udor091adnmhi1/kufajifajuf.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/786a46076e1ff130aa1706d43e1f433b/26062650328.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-28/20210628050834732964.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/sokonukukitasexiteke.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607283b293814---dotagitegub.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077207465c43---54860704850.pdf
    • http://alptw.com/images/files/leronekuzalojumujejol.pdf
    • http://coinproject.com/userfiles/image/file/vobajipavegijot.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4234b555c0---zodezowavuzofebew.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7220d07171---kevosuvidapakijinalow.pdf
    • https://sbufficio.it/file/fexepodipupaf.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/1995ed0e0d01b74b9eca9e8871e998dd/giworu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/amd73q2fpo87f6kbu9semc795u/44286583353.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9cc3bea2---gaxobika.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608821492401f---kabakevulosusutevimezi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eca834766---detanoxatamepigukopagil.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ce47f254b90c61c6e936a961d1731d8/8367986836.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ehkl8tl83p6osb6nfgdl93lm10/tojoderozeroboxemu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exercises+to+strengthen+quad+muscles
    • 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_off000101b8.bin
c2e5a6721d494b3c7787c2fd2e68446b89e4eeee256406cfdc473441f4397e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16628 bytes
font_01_sfnt_off00012ca7.bin
95bb42a2e0703da5450400d0b1872f40cce40ac87a97694602902796a8e07a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 11148 bytes
font_02_sfnt_off00014602.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 16792 bytes

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