Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c3fe93c5fc9b40…

MALICIOUS

PDF

67.2 KB Created: 2021-09-28 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0159b30d8bfe7951a8caae16ea96bd21 SHA-1: e7e4b972d03f6214f23a19a3143f7bd11b207fcc SHA-256: 61c3fe93c5fc9b40c1e7ef015c4476e4fc960ab73cea281d3069a1e7f9f5cd73
176 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it uses an image-only design with clickable actions, typical for redirecting users to malicious sites. The numerous embedded URLs, many hosted on compromised CMS platforms or disposable domains, further support its role as a link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 0 text block(s), carries a click-outward action, and is only 67 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 http://www.keizerco.nl/userFiles/file/87694974243.pdf In PDF document text
    • http://ingenermarket.ru/userfiles/48907679277.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28995f3d48d6bcb6ae6d1eaea8585d7d/54893156415.pdfIn PDF document text
    • https://teamcode.net/upload/files/takaxixojimel.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/72372031269.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89514758709.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/24849386476.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/43541284354.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/liwili.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/27597344612.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/jaluzexezezobukuwijej.pdfIn PDF document text
    • http://umartravel.com/files/nojepixu.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/ditifenegurinibugamage.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631779832.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/1101996416.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/4316449834.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/34063670474.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/95853252532.pdfIn PDF document text
    • http://daiichitelecom.com/uploads/news_file/subewofezexasesozovoso.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c1e5505b53b420f8983e175ac983c59b/fetegolugawos.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c39f54a2dedec23009b63303cdcb87ff/65376577103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=custom+super+wallpaperPDF 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_off0000ac49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 14200 bytes
SHA-256: bcafbcfa02da641f688cf21dca05f204f27c610694743eea58f8361834129dbd
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10436 bytes
SHA-256: 3ed29c6d87bd32c37cfd7e6e77d0ba6be1a6f2c9d1ec79786810a1437617f41d

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