Malicious PDF — malware analysis report

Static analysis result for SHA-256 0165cbae7e72fdbf…

MALICIOUS

PDF

119.6 KB Created: 2021-09-06 06:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a859964da8d28d8cff28493cd2c16d7 SHA-1: 048e420d1fcb790fd436cc133ea28946570e1202 SHA-256: 0165cbae7e72fdbfa36c8307b7b726844943b31bd295ad5efe090e715548fb3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised CMS upload directories, suggesting it's part of a link farm designed to host malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt, likely to trick users into downloading further payloads or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160939e9aa4ea2---pavajogebogutik.pdf In PDF document text
    • http://www.annaleehuber.com/content_files/file/mifutamojikepakodok.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2c87fe91---gabegepiradaxoxego.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vilurotumi.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/litojezewofina.pdfIn PDF document text
    • http://muszempilla.com/files/file/26509072704.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/firewebub.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/40657809487.pdfIn PDF document text
    • http://czminghe.com/upload/files/vumoridaxula.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f0945481---xigosevemal.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/xukulabekikupixokep.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7a5p9kine25n3tn44ljkjg93j9/44342945422.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/polasebotavepukutidorefo.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/kugonopomagafevuvulojewaz.pdfIn PDF document text
    • http://cocoal.com/uploads/file/19079493202.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/biwunodanuniwerutibizi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/bimunuxur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aeed63e33---29681137406.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/45795177247.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51bd75bd93fe3feb2ae21f671ce96ad5/kebirovoxujufulofor.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090471f3fe2b---tikabapogap.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210530152042155.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4248b5b2---2168052405.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/86672719133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wireless+communication+goldsmith+solution+manual+pdfPDF 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_off00016e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E53 18416 bytes
SHA-256: 2ccbf3a6171bce703ec59c5b5570861f0a50c8d58159cd82187ae6e4fb16a162
font_01_sfnt_off00019e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B645 11160 bytes
SHA-256: 884e94265991dac30186932d56bc6742659991f04a048493aa08e985e30dbb01

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