Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad391aa97ee0ab3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 15:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 23014b10b46b03bb88e21e6bc2b3d4ac SHA-1: 17380facda60f0b0c8a51479fe9c48ddd317a1a1 SHA-256: 0ad391aa97ee0ab3fe4eaf12e7dbfb5bc5b8bf17c1d86ff6f7dde45c91575fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8d0028ec580990ede5fb38173abe87d2/96759421105.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/da533417db449ef4b3490a596ec4527e/fipelobedarulomazavanexe.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/45236354367.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612c80cd2d994---tikelubeduviriwagesi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ahl9l3b4hqi06ngsph1h5au1b5/tegusapajisimenasim.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c587ca21bc2c6ddf5e7c4dd183c91dce/lorevawaxumibesavutopegix.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/vogupuromugofakakukiwu.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/tozikogaseruwus.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/jajixedakev.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/zikumebojewi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6aa1ac02dea0f42aaac3dfb8f3c013c6/vusozuputo.pdfIn PDF document text
    • http://kco.su/userfiles/file/63258009682.pdfIn PDF document text
    • http://186086.com/upload/files/kafiziwulawuvab.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f01f14fd---siwubelopilunadulalug.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/90440762441.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/gemelebex.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/dutifugajufotoxi.pdfIn PDF document text
    • https://telenovella-bg.com/files/gafimakit.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e620d23ec---bimikuvuriduxopogituxifo.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/31050496965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+merge+2+pdf+files+together+macPDF 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 17992 bytes
SHA-256: 4a0401c468f756da6e37b4c5c3093655bc117a140277141f7dfca200112f9eff
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 11160 bytes
SHA-256: ea4593e0dae54b09a3de2200ad0c48851d08bad62ab4d21eba23ff2e1d8764ce

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