Malicious PDF — malware analysis report

Static analysis result for SHA-256 66812dc08b9e900e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-20 08:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03c600abc12227d8bed6303c13cab0b1 SHA-1: d8a0ecc5b27bf4188f4cf22540351f3021f29a72 SHA-256: 66812dc08b9e900ea0ff648a0244b753b2e88cb261c8675c68483b53bd290554
156 Risk Score

Malware Insights

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

The PDF contains a high number of links pointing to various external domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The presence of numerous links to PDFs on compromised sites suggests a coordinated effort to distribute malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pendekaremas.com/contents//files/zarekum.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2671acfb---samase.pdf
    • http://first-group.kr/ckupload/files/93676472580.pdf
    • http://web68s.com/upload/files/58306418608.pdf
    • http://hodori247.com/uploads/files/49901546580.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g07l23dj1j7khs8ef29lbcg6jc/zegulinaleragatalimuxer.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/wanug.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/89f9f19063540fd14e487098a0881d85/21975366127.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gp1fao1qifv7i9uf3b893f9ql0/53046463107.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/96e426b3d19b91760e47776a9239439b/radonuvusinogov.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5oevrt56cipbs0im9hm90bbid7/90143381380.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6fa6e250---50102010104.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6dafd1adf---pekogu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k1eq17pelpota9nbm01g1vdcg3/refesapemibaxaxugepiw.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d946ccec---485503692.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/nemakanutuxap.pdf
    • http://fioredda.com/userfiles/files/16844306372.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=second+lord+of+the+rings
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1c.bin
a06594d439ebaa782a72b41a53f623c926e3754a230ba2fb801104ab4eaa63bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 2196 bytes
font_01_sfnt_off0000f7d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16792 bytes
font_02_sfnt_off00010fea.bin
6454b95d8b03cebaa6831c67e0840ea22e816eb9dd80338e3c86ff7d3e1c0b97
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 20516 bytes
font_03_sfnt_off000142b7.bin
996ef6fb0142369a91a68aff58fce5987d8f6baa5714027dc69feaee5b52d61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 10668 bytes