Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5a680c715e7d1b…

MALICIOUS

PDF

94.7 KB Created: 2021-08-08 09:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11393f4dd5870504683979d963373f5b SHA-1: 0d33f09c8e9fe971c799859748568d21f4efc3a3 SHA-256: 7a5a680c715e7d1b36c15b0c30e5bdab1a47055d44f287861a62f38890fd8cfd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, some pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aitrans.org/UploadFile/file/F1202108051815118139.pdf
    • http://aarogyamedico.com/userfiles/file/muzinasipasanonubowi.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7c39973f---72473233255.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ivr5ufe7ut1rcp23oea5msn6a0/tumedawewiwabobo.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161008642a71aa---buburut.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ce0ffda4f0a5793f52a2c1e172cfb2d5/lexikupisekilivuv.pdf
    • https://thuaphatlaihanoi.net/uploads/files/muzisudidemipapedi.pdf
    • https://groupunsur1.com/contents//files/xojatopupumasexase.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160dad3f740b04---85598413429.pdf
    • https://toananhmedical.com/uploads/files/gufujakokare.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb271a36---2938104577.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca43a1a5e---61389293816.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4bf331e1---7311974023.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0d1ce6599be1eacb1b3149cc6acbb470/56658337841.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7579ab1dc7---wodibixegenejijabatuvuxam.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e698c6a576c1f9da232ce3da9eb76746/xatenuxafemuvirem.pdf
    • http://sarljarry.fr/userfiles/file/janemop.pdf
    • https://proxus.nl/file/28348637520.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/volofolupuragil.pdf
    • http://ingegneriarossi.it/userfiles/files/manepizel.pdf
    • https://hr-serdahel.hu/images/file/kogefasasefimonu.pdf
    • http://bnblspecialities.com/userfiles/files/pibazawilupazowopimotit.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/049b3966b090125f98540f19bad01efc/bafaxab.pdf
    • http://faw-asia.com/image/upload/files/fiwadisufolofefijusiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=crossout+advanced+building+tips
    • 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_off00010c5e.bin
4d411b6cc2f70a29c1570ea4621ceafc5a6c4aa7ec0d1e817f8871bd0f42c0c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 11024 bytes
font_01_sfnt_off000125c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
font_02_sfnt_off00013dd5.bin
abd3c62fa4288a2bde699173fe193cd5f9917a7cfada9a679eb282034d6e374c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 17240 bytes