Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bd10e387d275e6…

MALICIOUS

PDF

95.7 KB Created: 2021-06-25 17:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2dc1b7ffbc324901e4c9735f60db0338 SHA-1: c355248955256c5e7de36d763604895a122722a1 SHA-256: 81bd10e387d275e6ae4c3788130c3a919c64b2ca692553c73a91f58fbfa16e6d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://crysiq.ru/uplcv?utm_term=an+about+turn
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ab57920d---22587894775.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bee430bac1a1132c080a31f5604f0f45/65966849322.pdf
    • http://0vote.com/ckfinder/files/gusoz.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/uvgv067lm5132hcu481d2k3ikb/85163067662.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b6ca596a---pokazilibopu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0l37jpjvsnct0g1k9nvmfhtqgd/59375412189.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099f552d1503---92465434740.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ta1rt75ehulfv62l4j2eeahccd/75480195036.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9ac34075---72788114815.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1df2abc8f---xafepu.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/mebonutowawu.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/90137183272.pdf
    • https://angelsstaff.com/uploads/file/lulodemekadu.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/k1ddav1qhmtuol3mf4g70umip9/40387320837.pdf
    • https://acrgroup.nl/userfiles/file/maseju.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af0bda9a9---39003849672.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e94d41bb---barovotoragebewoli.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1faef092---61154397549.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b98962eb411fcec355934df0908bef2f/xatiluxugokobadafareb.pdf
    • http://www.aadhar-interior.com/userfiles/file/zufogikadelejivakedifi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbde5e7379---39092259250.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/07395742e6edeaec2ee2c19d20108eb8/10133206366.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/dezizivelaxebib.pdf
    • http://safarang.com/basefile/files/96033883126.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/a0n7cfv0bosc729m80rs5damhh/71335842146.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_off00010f1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
font_01_sfnt_off00012731.bin
ea12fc70cf836ad79d4872d19d0141393ee7727b5a22b01ad78bce642050185e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 20532 bytes
font_02_sfnt_off00015c14.bin
4c4ba5b83f22e9f9a516855bd23ba1032185d0ffa433135df6ff1d26066c3f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C14 9884 bytes

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