Malicious PDF — malware analysis report

Static analysis result for SHA-256 a857329e0a860576…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ca538e57cc31001f0950e90802073a6 SHA-1: 3fb329b91f70c64f6fd1511334d596f947886b02 SHA-256: a857329e0a8605763434e0eaed2a328dc970afd42917c43f798e465781e52c8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by a high ML score and ClamAV detection as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/58d038a79e4786e630f3bdaa1c1711cf/gavademuxokeme.pdf In PDF document text
    • http://licausi.it/userfiles/files/dopuba.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/43698124378.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b312f2c91---75168056680.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/19986723744.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5778f8c4---kenapi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/28942434271.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xubesuvasofivetubapa.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/53452622450.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ce64071a---13528423831.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671bcb38e4---19857405914.pdfIn PDF document text
    • http://shamayachts.com/upload/file/91457655638.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd460da214---kawizikusadaw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9ac932461b74b31333d87c52ac254a8a/14314049095.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9e836c65---54307722310.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/18023102260.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dl9se5csljfq8bis9ussr1p1tt/rupujurole.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/zajekudamaligoxefup.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/gumegatakapen.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3c459f18c719ebaa214c3410bd622c68/92972365950.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/refetizatetafujogamuwar.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/5938985122.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xepamiridutem.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef985aa6e7---mekizaxubiwetemigofuxubob.pdfIn PDF document text
    • http://www.520amis.com/upload/files/96700491522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=transformers+the+last+knight+movie+free+download+in+tamilPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16624 bytes
SHA-256: 5b3fa9262c5b7ba6fec2f0abf18a02ad2b6d815a72967243aced76187e57fcc3
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 11008 bytes
SHA-256: 67268231e86ee48a1a563e56372da4298144cf27e825304fa72000fefefd5c7b
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1