Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a7375a9a5e80f0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 11:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d057d8479cdb036c74eeaf5052ed7583 SHA-1: 0760a8643d3fffb841d5cf1dcca26cc74199663c SHA-256: 64a7375a9a5e80f0921a4c22893e36d42697daacfa5c71b212a77ba1684704a4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm hosted on disposable domains, a common tactic for phishing and scam lures. Heuristics indicate it's a callback phishing lure and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://pactolous.hu/upload/file/zurasajaruwapekij.pdf In PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xasevuno.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/kibuwejije.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad83cd340---98763202363.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147154ed1ce0---13365329809.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8413836c---56503572166.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0411941001631710184.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/44347161501.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/94405873782.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163090719831.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df365ae47---zanapitogijasus.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/botalon.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/96744501601.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/85917970792.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/luzaxefajawunemaxut.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/14483531070.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/13946894223.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/82777230913.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/dekujuvipe.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jifumikakavutubowapojafe.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/63131571579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=justice+league+dark+apokolips+war+mp4+downloadPDF 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_off0000b160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 15368 bytes
SHA-256: a1c242c1cd9fdfd6fda45bd4f0269baaca0cf0b140d2be29284ebf16a3f2f191
font_01_sfnt_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 11204 bytes
SHA-256: 5164893616f73e3053bb2e700b9b88e087ab36681692587235768fa56f90aba6

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