Malicious PDF — malware analysis report

Static analysis result for SHA-256 b608aa8b04e34cad…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 03:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1740d94d16743fa0f8ef92b3906ba546 SHA-1: ad5c6fd7447e5954e0880f2de5b52aff03fbc765 SHA-256: b608aa8b04e34cad09302cd8918ff9113198379d0d784e508ac02b5d802e07a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. Numerous URLs were extracted, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=custom+rom+without+root PDF link annotation
    • https://florerialafloresta.com/ckfinder/userfiles/files/raxogazomiwibo.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/juduvizuzetaworiperuki.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613177b08d63f---30616884695.pdfIn PDF document text
    • https://hse.tw/upload/file/rozeke.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/febuwefegoza.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/zuvevag.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/labagilevumuwuvog.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nagipotuvepoxinal.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/wapazufazenafukowezaki.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6241663d031a7643735072c2335edf4b/tikufakutevat.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/93434672188.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/95093084199.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zumefa.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/51843522476.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jakenedaxexawadaxatura.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/30682574168.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kibikarux.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/sulejezaxunabi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/16062911803.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/39186575358.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/13420093379.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fijuketogixubetowakukem.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0f66508a---wereworemewuk.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/nakagigebaxenojitepitu.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/27652783926.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/45334359384.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 19160 bytes
SHA-256: 8f2050c9755312bb6ee6e02ee872484649b7999b9bc76c772a44104e115dc614
font_01_sfnt_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 10148 bytes
SHA-256: 194da54a66f87e7cb1ea0562c62b88d87c31383c120faf189cb4158e4a1723d8
font_02_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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