Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65d9a014f28a28d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-09 09:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea1b6e158be3a4ab582f243d02d40913 SHA-1: 342ad28a6962d4daf940bc737ba99e1b683698b1 SHA-256: d65d9a014f28a28da40678dcac14a2508e450175f526177e6fff5e4b17306eed
176 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with tech-support scams or callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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) or Microsoft license-boilerplate 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://msamerica.net/clients/873634/File/gekikejefikokujekudig.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/i6fotkg6qrqp036seeqv5knn50/87577640606.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/80879556840.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd5e8618c---41380857741.pdfIn PDF document text
    • https://papiratisk.cz/soubory/18939086552.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/19900950111.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rurupuzuvojufim.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94ce43e5c---93789012208.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281049181830.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/posn3sqibno4sechn5l8vp1ab2/71505921510.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2s12n27clo7lj907n5jqknacnl/70345299301.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zigaragozokigenomupe.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/84189615695.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcdd9a89f9---28428250892.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/boveguxejebug.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jugupekupibolan.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rrvfsarta1cjvsu15dhs80ljc5/toxejenowuwege.pdfIn PDF document text
    • https://sapporopools.com/contents//files/woxojugebuzodoxivon.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974adb2bcf---22125720910.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4db7e457f---galifat.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801c4a40f3b---26399910141.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea66d773e---venovuduvupaj.pdfIn PDF document text
    • https://wagaskar.com/media/44697365720.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0a7c19c19f---fixavikazisokugisido.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8975800e5c---26030585960.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7073eb67d3---sogite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+reset+drum+counter+on+brother+printer+hl+2270dwPDF 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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 16704 bytes
SHA-256: e76332e8065cdee28e797ecdf9f80572a070eca97ad3b9c4615059972f9b82df
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 11228 bytes
SHA-256: fdc89325e7f951f70c3caeb92e86f1f3002f9914e488d797ec29b1e12fb2e9f5

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