Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad11c864e77cadf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 02:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 980eb8b64a50eff795600552ac797bcb SHA-1: 89198fbb2d18e747ec19e83fc50e3b3278ef765f SHA-256: 2ad11c864e77cadf4189f6473d07827df233608c19e398142a3190ae5f8bc080
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to a link farm on compromised CMS uploads and a callback phishing lure, suggesting the document's purpose is to redirect users to malicious sites or trick them into contacting a fraudulent support number. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=how+to+empty+recycle+bin+in+android+phone PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d543b7824e---jirenofe.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dopetuwazafizibimodij.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/93717409563.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/bivefunubaxosodo.pdfIn PDF document text
    • http://belniig.by/public/file/71986492178.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/46740539883.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/simawi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/popekorisugikudaxow.pdfIn PDF document text
    • http://elsped.hu/files/file/6990934373.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60095728294.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bd9229f4---88610711750.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210907175100478.pdfIn PDF document text
    • http://dytac.hk/userfiles/fazolekepebitotibesutapet.pdfIn PDF document text
    • https://suruburi.net/mm/file/18670685849.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/lusokare.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/4432869679.pdfIn PDF document text
    • http://email-database.info/userfiles/file/29793665057.pdfIn PDF document text
    • https://il-gusto.com/images/file/lisujozoxemevegatefimoxo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/aa11b416add34feedc9235a536aa0a5c/maninubu.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/tibejinosuvazibogugamiz.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/68337566404.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/peniviligupefa.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/81566869522.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_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10940 bytes
SHA-256: 4ec4dfcc2ce75ce53f0b41b5c42e2762f718fe8d679ada66b8ead5c89a819fc0
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16848 bytes
SHA-256: 3870cc205583c5206b9155550bf59b3751939b175aa63f28306d35a3fc959cbb

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