Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf88709493fb0aa…

MALICIOUS

PDF

81.2 KB Created: 2021-07-06 14:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 116ec001b03ef16efdb93018e221d5ea SHA-1: 0bca57c16a6780c5e813a3d7d32159b1e77ad15b SHA-256: aaf88709493fb0aa2629a7ccf48c9e4a5edab60586ab905a82e76121d1007b27
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including one pointing to a raw IP address, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the heuristics pointing towards a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and linked URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://prvugkh.ru/uploads/files/dezizu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd5ee89bae---muluturobanuk.pdf
    • http://157.230.241.115/image/upload/File/17749096662.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bc7a41c0---87862633944.pdf
    • http://www.asslar.de/downloads/komom.pdf
    • https://mn-lawfirm.com/box/userfiles/file/64064765177.pdf
    • https://stopserv.ru/files/file/tegigujekipibuxebiset.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ci1q722ug9qh7j7168kf2naah7/32130207296.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0274a40dba---logujixe.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dda1b4b1c62c0772b2144a60b118d208/jedebijefevofasaborezovem.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/towegusebaraludike.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07bb7f8ab---17471531263.pdf
    • http://crmrealty360degree.in/userfiles/file/gawadil.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/30f853182653e805f08229b2caed38a9/bolarumewukumefube.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff064435a---givupumixexujudu.pdf
    • https://bushregenerators.biz/userfiles/files/sekabizuvizisisopu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/47e567e44ab0960e7c86d6ee297e914b/wolisifasuxeletija.pdf
    • http://manavpublicschool.org/manav/userfiles/file/17716008690.pdf
    • https://bharatbiodiesel.com/userfiles/file/96208780011.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3531086ea---segajajesobevamur.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f39854a6---46232717810.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a42191a95eef1ef3a710127e35603d55/sifigexajizoxutomofagukal.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c54245775f3d498db394007ffcd419a2/puwedolizotuvavajipeve.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607432856b481---61484830690.pdf
    • https://hashtag.school/userfiles/file/33989061317.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=topics+in+stereochemistry
    • 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_off0000db82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
font_01_sfnt_off0000f399.bin
fe7fc4111e259e9fdc78f7ec228f8e5863010f53181ca59a059b37bee388d6df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10508 bytes
font_02_sfnt_off00010b62.bin
1076f61f276e9dcde4f68f2d499a144166da0a69ab286ad34135a58494bc728d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 17008 bytes