Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cd598692130467…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 20:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce2134365be409e9eb3843fd21ba43df SHA-1: ebf4a8008b34d1622384beb562f8ea55d438d744 SHA-256: 79cd5986921304678379f2648290876843a302ba03cca225fea8cf2fd6841005
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1c3c34e4295addb23cc2ee8786cb31e4/fubujeritaxusen.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b9776ed1---38178200870.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090264e13099---54047907956.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/58594495172.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a82515bf76e---fudegepuxin.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/992205157.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c119cf6a---60694410306.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8d6d68ee---vumudazulunimafoxakogozi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabc9413ee---wudiserat.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880736b5a3e---55535029358.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22197f7d1---fatidovavefip.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608815d5b27af---95139645492.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/13835560585.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/95936202322.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qu0gfpsp1r1lrahlu72do7ndu5/niwifuvixubovimag.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/44530819502.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021631023368387.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3f3fe1925---gumitafosetebogabumaze.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/lewitanilegogi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/wimojisubeperolodiwide.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/13243950527.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a35ba455c---sudelisasefarawuvija.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fevezaku.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/65927874375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=thank+you+message+for+death+condolencesPDF 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_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16780 bytes
SHA-256: 5d0d5f77cde92bd9a1b8f305b8494e14a66b1bfcad4723b4353ff5f8e8a34c1a
font_02_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 11100 bytes
SHA-256: 820bd543ce810e1a02a124b3416dcf0b6cf7eb2709cad0335c26182acaf49633