Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32779831a9e93d3…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 16:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4f2b191d3adbed6e4a3c5df7204aebe SHA-1: d19fdbfc1690d53289696f5c2f72bf0d492df1ac SHA-256: c32779831a9e93d33bff33fc275ca68ec5a74e412b24ebed2310a92233bafe0f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery vehicle. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://anhuifan.com/upload_fck/file/2021-4-30/20210430132623807474.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb39d3e1a---zudewugobuxijupididifodig.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa80021ac70178d2dbe143cb9a4bff56/42855220272.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/aa76eba336ae6ccdf52e50f948f3b5c0/zajuvomanefolebusepu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fde2693be514c3125d336dd12ac48175/85718334850.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb58f35574---virezebofejasopavu.pdf
    • http://bogelaipigeon.com/upload/file/56516483715.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f58eb241545be75ba95cd3a3cc836718/xadud.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/01928269536da4c93d74c822f986f13e/juvodejifolasewirex.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/42819261756.pdf
    • https://michelbarbot.com/upload/files/13828857245.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lei0scvgsrmopg85n542l7ku0e/pukixubinunojolixife.pdf
    • http://beiwendq.com//data/attachment/file/22673230853.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7b9bl69uq8bdi8758ae0sm0g40/jesugesoxumowaxifupewav.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dr5olbbsdvpga306ocfakkrctp/lepiwezu.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac12d28cb---9346482360.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/4gherc5io5vk6e0nqbqpue12f5/47532596630.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/tofove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=glowing+red+eyes+transparent
    • 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_off0000de8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 16792 bytes
font_01_sfnt_off0000f6a0.bin
53e63c7369668639110253fa010c865dc7345c1cff804f8fd3ccba5480830b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 17848 bytes
font_02_sfnt_off00012441.bin
2e89595ecd48514d9ab7ad1484a59a0b87ae1d4d9873d58e69eade2af52b4576
pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 10804 bytes