Malicious PDF — malware analysis report

Static analysis result for SHA-256 306994bc0c0e1ccf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 18:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f7301719756dab16476c5fbb0393bb5 SHA-1: 23a818ed1be78a53aef2cd4e1b635142675e1ded SHA-256: 306994bc0c0e1ccfe4246b147f2f86e83d08a2cc48cb1ef751b7bff468f53e28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=which+processor+is+best+for+gaming+in+mobile+under+15000 PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6708ebe0a4464fe331e2da062e1af02/52198592641.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/sawuxerewebulorugezalefo.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/19171748916.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/19567364217.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/98345776680.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0acdd8f61---poxelekiv.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/jususurezuwilamavufixem.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/notusemiselaroxig.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/jetes.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f674072b27---18539569594.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6c4e0481283c0ffd9c79748f66af56a5/48820206167.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/40023057415.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/8268341935.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/turejelerotubipipop.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2d6d3103---xinazeximejikarefumojigu.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/62801499112.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/65674280335.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/95949961872.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/55644460661.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/ratemojiniro.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8af7dc4b5c25885811215650f5b6a44e/gezugawi.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/80271835972.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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 11608 bytes
SHA-256: 7e4ad4950e342208db3f9c3c7a076eed9b3cd238baf1f51e6f6fc30e69621321
font_01_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 18060 bytes
SHA-256: 73285c3e3a12b26e8e97d73f66c94047a010d295f76da28f202907d37d5c1160

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