Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f7e2502d3520ab…

MALICIOUS

PDF

74.9 KB Created: 2021-07-18 11:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 513ae4e25ccb4100b0cf0fa1b5a50e84 SHA-1: 9557c902788b1ccded57a951cc56531e629cf275 SHA-256: 34f7e2502d3520ab6c59a7d61afb045be72abfb4b97be110b465a09e9c61c371
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern points to a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jikaramen.com/uploads/files/4447167018.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a7189985bef9e2e5f68cde7994198c69/88265873610.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea2939e07---ledumodopikosefedural.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/13260202046.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e577938e647---26385822735.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/rilasaserokisel.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/qnclum7o293p0cm49fglaqec66/12956001418.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/19316691302.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/34690828421.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b382f590c6b---ruxovujepepefonogaxade.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/16641500389.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/27186011795.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/57973462264.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/3641899205.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609212ca27dfe---3780090154.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/74618565069.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ef5b7d1ad845104d755a4d1a866e2c5/90586432572.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/83pr2vnhrjj8t3g14mjcjucu7u/piruwo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609230d394f1e---42952441940.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/66808986136.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf254d3a06e---vitogolalar.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e62bf254---59405121097.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/77399d4a98cfb4ec5538c45a90d79f36/33602723802.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/25256228281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=learners+enrollment+and+survey+form+pdfPDF link annotation
    • 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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 10804 bytes
SHA-256: cf39adc4b235920838e98c8ccdd16832b5a8cb7b073fa558b8ce248c497f4588
font_01_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 15936 bytes
SHA-256: 7f9f892f01c677169599b78c3dfc2d985ab2c382c3ea5de738e3056ce2bf40e0