Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e8c13a9fa3e626…

MALICIOUS

PDF

76.5 KB Created: 2021-07-03 02:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a588088a83ed8780a09fff4185c3cc9 SHA-1: d5e007cfd2d43d0369770790d575ce5580270201 SHA-256: f7e8c13a9fa3e626aa2577f49e46ade11f19239fa84858fd0c266ecb6d3b0410
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to WordPress installations using the 'formcraft' plugin, suggesting a link farm designed to distribute malicious files. The presence of PRC/3D content and a high ML classifier score further indicate malicious intent. While no scripts were directly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba335caca5---gapibujinamed.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5badc4ebd---jamigikugejaxiku.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-21/images/files/28313106887.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00ff2b669---65883861988.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/bumolam.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56400616524.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/dutigorusidusotifowuriv.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b4c9ebd7---wopepukaxonasuba.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d32dbf35---11697509496.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081624a60030---70072276018.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/134da5c219f79d9df25e240ff978709c/kuvemopolomivuj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dd337fa2---wesozezekolakekowili.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gosimupakowoxolosotokoluw.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xagozanadefeju.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/be13087983d96d3abc62680d8561ba38/rezoxogudo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c2dgnmqcoqa83iu96ra3d1t6qt/98856534417.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160712a32eec32---39447323868.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1783661993942bb2b148f178eea9fbbb/pozuba.pdfIn PDF document text
    • https://avenue102.com/uploads/file/63349919343.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65587a8a9---tosemegirapogovik.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/20741793993.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0fc7a719---21962066228.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a385139d790---80437791795.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/nubonovaxu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/57e49d08764b2a98c6c7019a78c4e8c4/masofedufojababalux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=seaford+dry+cleanersPDF 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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 17032 bytes
SHA-256: ff328649816f46e4fe8415c26f17a5c947b47c1e1f6c9da237c9f31c0cab89ec
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 10468 bytes
SHA-256: 2be45b8eef257250ba6019e4f13bcf2b5d479713070b51abff239602c5ec4315

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