Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec42f8cba52da091…

MALICIOUS

PDF

114.0 KB Created: 2021-07-13 23:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 769a5fdcaab603a15a0e985fbe9990b8 SHA-1: b3934798be6ef3a50f073b344af287da56a0226f SHA-256: ec42f8cba52da0917f267a6139d85a1a4afc94bee53985ef0764241ff8b5ce1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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 https://medvor.ru/uplcv?utm_term=the+sick+role+functionalism PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df93654bca---fibakob.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/novigadurilimapob.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/69bf5c126fd78b393149dcae525e8abf/lodanefukazukifugozije.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/46489888866.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cddce988f7abf30101bb9ab92a55ea7/pikafebodafisodive.pdfIn PDF document text
    • http://dzbnf.com/upload/file///88072546036.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3kpaueeu3r793jfl5lheugkahh/76487577279.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j8sqabbvl8cnfo1609e9t00025/fimasepelugur.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/35678499316.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210625215124.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160929eaf620a4---65984332038.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/97132683222.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e84ac0eb7259e4ec1cc276755f357894/zadazaneneg.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/kaveja.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/84548432977.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f519dccd39a86c99a453dd235fff6bc0/logiwoderemiv.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/5051475765.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cmtd2el07t69jq23vph17k6pgq/44773434547.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/629be150b0cbaad2b4bd3f8f3e14156a/wemobi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609462c054400---tijirotixerapuwa.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce16b9e800a---25425402655.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a8549364---vapujugeripulapapobuwon.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/fital.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918942668cb---7241646582.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e463887342e---zapuwomezopasut.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3nmj43a4n99mh0s8t6cdcjbkv4/pubabebozaxusipov.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_off00015d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D31 17036 bytes
SHA-256: ab0e9e57b147e9901eb34b789f5936a4bb8cbb0e81cdd3829e23355edfe40263
font_01_sfnt_off000189c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C8 10756 bytes
SHA-256: 1553e0876b6293344635337e4c3d89f35cc1b34c94ab6d97ee365cdf4e44a71f
font_02_sfnt_off0001a266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1