Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdae160a3f739845…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 00:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c31c7f6f376eb4485db600a09aa2c714 SHA-1: 4cc6ea7b83f0c06b505c0dbe0e0d44493788d765 SHA-256: fdae160a3f739845a3a3710f2f52ed2a9c5bcbca1ce9bcd101261914f0e25779
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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://crysiq.ru/uplcv?utm_term=clothing+worksheets+for+beginners PDF link annotation
    • http://inbjnews.com/data/cheditor/0603/files/42020332776.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/38126414308.pdfIn PDF document text
    • http://cortabellanews.com/userimages/dupitof.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/25599800804.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/79643067735.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160707fbbef8b1---bapebokesosiwawususu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/senuduzexu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad9c5a697b---19736491701.pdfIn PDF document text
    • http://deltools.com/userfiles/file/luzasatijunapi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/390ba6150be8d4d8800a51607c3747f7/tajiboxigagekibabe.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/34775077158.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/55355408670.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/jexokozazadezetododafolif.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2131a9106616035b672f9d36e046f662/titewovumifavowolukidole.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/q53ajdhr13v63msm01pq34eh7o/66617220578.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d8d34f20308c2bb08f8c9871d09b9c5/50153407189.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/27063949551.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a8606f51bcc124f37b6caba9c0cc4358/volemasupazal.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bedomumijukujufisif.pdfIn PDF document text
    • https://luminex.pl/upload/file/ginitiduvokarepefotunusu.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/48391679659.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8fbf1c1da91a9e65d506efe4437efa31/45664054780.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/bowaka.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c06fc2ca995923c2bbe8e5d24112685f/61467096895.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_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10680 bytes
SHA-256: 2beabad17c72ad5462e47726732d49eb58c382b11235f6ef297076759c7bc148
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 18736 bytes
SHA-256: 71a8880f0eeb1e5d9906b7530b4e8ed76e7881c77973da8c3b3b31f1acc12383
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1