Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd098fb2174b4a3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-19 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acf522503f5d2eae9b2df6ceec18f948 SHA-1: acc7968f37e412281829c84dc5f3e0c7460e9b56 SHA-256: 7fd098fb2174b4a3a5a13712d0cf1ba9441e7126ace1b84ecadc32d4f6347d8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-based screenshot and embedded links. Multiple heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://anaksemut.com/contents/files/xivuliritokok.pdf In PDF document text
    • http://st03.it/userfiles/files/29544462799.pdfIn PDF document text
    • http://cbstav.cz/file/rurulakujijalifesafe.pdfIn PDF document text
    • https://tivicom.vn/upload/files/42810352620.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53870873215.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/22317197635.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/44347650675.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dhjcdqs172e15ll1j4r005n1vp/nozojiwi.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/wifowuliwexumopo.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fuvotuletedinosarukawefok.pdfIn PDF document text
    • http://net-marketing.hu/images/files/77242049740.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/disixejekofewefumivuji.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/73157689684.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/fosigujuxebudubutosope.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/rerojodijowovovapudaguwo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b442de43---81772425054.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0b76ee5d6243cf33133e781c2799893f/40861505186.pdfIn PDF document text
    • http://acelybio.com/upload/files/pisifozamari.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/nuvupesosumaxopaf.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210903_84FD24702F0E63A9.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/68837710724.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/65889597326.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/92845253723.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/49996659921.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jufenafawofobitevotem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=obsessed+korean+movie+eng+subPDF 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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 10868 bytes
SHA-256: b513466ff8bd599d89787d2846077df4a96a56c27e3c3dd753df6ae58d272a01
font_01_sfnt_off0000c8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 14504 bytes
SHA-256: b1bab81457b60070d15f8aee25a7b014f2627de19bfebe67a562c4d44ecb848e

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