Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56f33f5c5c1f1a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 22:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9536248df7d908e71fbe4000625e2862 SHA-1: f18dea3c930cb7f45a2ee5d549f39440c4db38c2 SHA-256: dc56f33f5c5c1f1ab703075640be1f9981ea71b6284cafde36b6ff0ed7ff6b4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URLs imply the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=pes+2017+iso+download PDF link annotation
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/taruduvurijawekak.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/87611160711.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109070931256538.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/sogudebupakujusu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b2a2ed50---fumuwaguzavebof.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/bitomim.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a968f159---fuwakuxen.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/16761058429.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/20696192531.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614234486b895---valadutusowedojoxobib.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/96673841136.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/30074936928.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/ziwabawe.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/nelefababoradojidipib.pdfIn PDF document text
    • http://livestocktool.com/d/files/kodul.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/57898344122.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139630072a64---pazanixesazo.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/naroxozugun.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/77194215562.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/fipovivelurudiwibeloxor.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/38793111217.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/67662819936.pdfIn PDF document text
    • http://mc-opony.pl/files/file/negeniwatoloza.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rafovipuletawiwixu.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/molinigatopi.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10476 bytes
SHA-256: 8837dcf52fdad2153e415c76eb761020cdcfc805dc1d4dd2551ff8f374b16833
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 18872 bytes
SHA-256: 22a9bb7cb1f84327943209255ab87d2bbbb1f0c620bdd717069880db97721e64
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1