Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dd33949d0c2725…

MALICIOUS

PDF

86.6 KB Created: 2021-07-27 00:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0a0574c31d2fbe612a183c33bcfce21 SHA-1: 5707e503dcd5884b85a1246238a097ebb28cf809 SHA-256: 77dd33949d0c27250b831373180cb25146256e87240be660ca7c7658a892998f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, potentially leading to further malicious content, and specifically mentions a 'Callback phishing phone lure' consistent with tech-support scams. While no scripts were extracted, the PDF structure and URL patterns suggest it's designed to trick users into initiating contact via phone, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 http://www.hydro-tg.pro/upload/file/zeduzekaxejip.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9455fd408a---58947663810.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/lejabuzafew.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/wutojowejexesagudu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622369782.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95616238120.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/36627470848.pdfIn PDF document text
    • http://iphysiology.ru/upload/62152659352.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/21641009800.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e1c2406ae5c7bd32c08e206bdf0c70d6/zenuwibaterose.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/44114593986.pdfIn PDF document text
    • http://rhondachem.com/d/files/48232907052.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addc74e20e7---75013056446.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/newixom.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/20329197989.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/welul.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e5d07487f0773057d0ade7d9a90c39b6/81489361619.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/33132349833.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f86810103a5e34f0e06f40a4e4a3d2ff/95033364256.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ta4fknrl9ptpc3q3accb4hkt2j/xovefozabubomumusabawuj.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e2b00758f---69084862888.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/borivixafilofisugufinup.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/viraniwiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=christmas+writing+worksheets+printablesPDF 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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 11048 bytes
SHA-256: e821b73907a5977d6b360f5be35b70d8b1bbbdf9dba8bfc60edadd5aa28289a4
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16560 bytes
SHA-256: ee37152771809faa26a175891687f4c92d4a366fa3e21f3974b6a7b4e2367c36

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