Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5a49d037e1286…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 03:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 627aaeea461997bcf065083c88d0d8f3 SHA-1: 337c5fa89eb72daf4394e049e4902c3392da8f65 SHA-256: deb5a49d037e12869328d44ab0a1fcccbaaa5a78fb87ca2fdca69a2076d71220
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=how+to+save+photos+from+internal+memory+to+sd+card PDF link annotation
    • https://tennis-samara.ru/img/file/tulepumawuzulakajali.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/91115489421.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mr983m5fq2ugpm8eikr63bqk93/76516493954.pdfIn PDF document text
    • https://telorgabus.com/contents/files/97913425322.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/silama.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/bivuna.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631074163704438760.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/92616643795.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zikotuderej.pdfIn PDF document text
    • http://vitrine-prof.com/files/87016314146.pdfIn PDF document text
    • https://reha.bg/content/upload/file/javesupozasur.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/jipuxoturimegojid.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/gelafusasebegibopa.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/26415727427.pdfIn PDF document text
    • http://runhouchem.com/upload/files/32407980807.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xutopenegubokorawanur.pdfIn PDF document text
    • https://digireg.si/upload/dudotudukunarazimi.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/nekutevimazevivog.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142e483f0647---60650668083.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/433cee0ed6e9b2f656119354f85e5d50/pewobiwufipikifawivo.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/32874542579.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/wesepifiwuvu.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/mowexunaginadofegatamesoz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 11140 bytes
SHA-256: 97ea1b25fec0601ca221b7cbae317e48635fe9c761e5b2fc17f394f52beffff0
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 17792 bytes
SHA-256: fd5b5ee76bbae59dc0b6ba7d421f38c35c3d8dc049b2834dfcd486e5ced50c04
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1