Malicious PDF — malware analysis report

Static analysis result for SHA-256 075565dff8d77973…

MALICIOUS

PDF

78.4 KB Created: 2021-06-29 22:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c96858b2f777f721ac892bc81553fca SHA-1: 6249bacbc301823e890466cda16ba54149463a69 SHA-256: 075565dff8d77973728eae3c66285668d492dd4b8ba075c9e879d06a56fda6fb
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://philabc.ru/uplcv?utm_term=tonight+you+look+so+pretty
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/267e8e1f716e61d719762a958a677569/98186750469.pdf
    • https://yuss.it/file/62136811302.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608315c9d9656---vubarabepabuxukuvanelawal.pdf
    • http://cnex.cc/images/blog//file/68400780461.pdf
    • https://haysalon.com/public_html/userfiles/file/jerubemirerusewomefezurax.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa4e47301---somoparuwim.pdf
    • http://quadocdao.vn/uploads/files/fitegivufugo.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ln8ko9o92j2kcmrafh56r6n9b1/ripugeganazuzeke.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/ziroxirupifisukiliwizamuj.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/66451589935.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/gajadunexeluwepakirexuxa.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75c6ca822---dosisaka.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0adba571c---bazugozegexasabajivixitu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5bf9c70bc223fe3fda69ee9cfd964670/79240046359.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41334aad8---89551460377.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d00e4d4f5---munaxeroridozipabarezakid.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/1kdchc3vdb0a8qgm6vm0ukbjlh/79180565154.pdf
    • http://kstarsmall.net/userfiles/file///30634293003.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6b4e8a2d---50071532698.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_off0000d1eb.bin
264d3eab846e26ccaaddd603f12b7d887dc62449173dab0e2af0cf3ab1ef0a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 10636 bytes
font_01_sfnt_off0000ea42.bin
7af7fe9f522c2626259529e6b92899b8a680b22b01253e06dbb510e58b5b89ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16856 bytes
font_02_sfnt_off000114df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 16792 bytes