Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac22d35ca578a278…

MALICIOUS

PDF

87.8 KB Created: 2021-07-08 05:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8a786be8ebe03fff7630b59193840b4d SHA-1: cdc5f473fe7f772b244003cd982e92645bb00f84 SHA-256: ac22d35ca578a278a4b56a93f1f6f2767c39ee851adf4070f2a1211fe0203203
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mfijkh5mceuu0l46jh3qbb568o/guvupazedipidepob.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/46395942559.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b43c97406fbf46eedced08ed5894c07d/lagejixono.pdfIn PDF document text
    • http://jaatkinson.com/userimages/dorut.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/73ef02725fe9d450af68e9a0cc57b6c5/maridudebifeb.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab4dd3b6c---lajeruzajozedus.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfj94vbo5hkrenn1gfflee826a/zanad.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba009ee20d7---kokofuwebefivixemuz.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608873445ee64---28006236191.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/karit.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09bd7ad80---49176623284.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tptr3pk9s94ajt2euhii16vvah/todizukanu.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/69676163425.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861bdb9c7bc---81947008917.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/39532656525.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d89284d7---foxikidowape.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3462918fb.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/eb9502d769b45c1c883bcd692b93e3d7/48698240759.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/muxifiziri.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a0329be625bf117e730aace892bee86c/derapagixe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacda0effc6---zamikuxatuxekuda.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105201716.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/32324630671.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/10249984337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=knock+knock+full+movie+2015+free+downloadPDF 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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 11136 bytes
SHA-256: 37464f5d67a45cd4521560277eabc66c0b0389d659223f6e3f22985aa35ada69
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 17540 bytes
SHA-256: 2574366f686d1cc155e01593e15eab741c842d64a9653daba2629cbcc6e1f474