Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a677cd1a2f9f96…

MALICIOUS

PDF

71.8 KB Created: 2021-06-25 12:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48c5a0fd0036458768ad5d56ab4fccdd SHA-1: 3694155e3859155fec87f1bb9d101ff6248da7fd SHA-256: 31a677cd1a2f9f96231150ffe0c7c1314a214f62c4b177fedd023b7278b66fdf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware-hosting sites. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pistant.ru/uplcv?utm_term=souryo+to+majiwaru+full+episode
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9a5e06f19fec5ea52c2759b5f1b89ca7/sizeraxibavowo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585bddfdf8---93157543561.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7bce26a0dd976f2d013003f7cd91304c/dopitopa.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ba7dacc3---woredarut.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2442e1b80---84130692875.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe22cacaba---89238928608.pdf
    • https://smilepaper.tw/archive/upload/files/37913331893.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e01ad87ca---vodumi.pdf
    • http://ahsaipu.com/v15/Upload/file/2021429110235059.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/vunukutulobof.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/s19u24crvu1j31dp783ut37k25/mabamoxowosu.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46bbd58dbe---geluxekevi.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/lugl6ov9qaais34031n38d3khe/48228337472.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f88300a25---vojumaluwiketuwoz.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/npbja00pok09p0trb9a19jmbf9/fubaloromoboji.pdf
    • 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_off0000b585.bin
f69a3c222ba1c472b05b9f9bf8ab0bc1260f0df5e81817b684cf95eee80e6e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 11060 bytes
font_01_sfnt_off0000cf56.bin
882855e469552350d2f711425df8d4cebe807719c71dd1675f1807ae230314b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 16672 bytes
font_02_sfnt_off0000fa74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 16792 bytes

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