Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b255e7c18ba41b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 01:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b29d103e20803674575df2daf5fe7678 SHA-1: 4165013b99232a0530e430c1eece8d3f41210ecf SHA-256: c9b255e7c18ba41b04b5ffb3ae3ff93daa5971cac14a3cb268b8459c4c15ae7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised WordPress uploads and a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern, aiming to trick users into clicking a deceptive download prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=game+ppsspp+midnight+club PDF link annotation
    • https://cplastik.net/data/cms/file/bukarosutasubep.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/60988015296.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357f0aa533---vemavuka.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161307c83a7bdd---raloboxopekewowora.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613908cbda749---5549138635.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/46753751627.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/r7luteno2qfjf8unm9hgsftd7r/89055302313.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/zegonexamose.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/18725807763.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4i7v4majdkfrum01nfdvi9br6p/vuruw.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/35711487641.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109070043246187.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/96385788230.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135363df0a55---67840701413.pdfIn PDF document text
    • http://kco.su/userfiles/file/67651039994.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/28788554551.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lotjrtp2riq40v5auieqsosjh1/mowimul.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/69752476608.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/93798513009.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/66936758398.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/jikogakubakuwusaxagup.pdfIn PDF document text
    • http://ymmicro.com/files/files/25688248573.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c0fe37331a2bf3ddfd084154357d2ba3/zimuzasavomovapo.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/31898312291.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/82981185647.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 11020 bytes
SHA-256: c0a942d86c51531ed196813d9f829d5e14cde4c12b64fb449b071585a0cc4705
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 18592 bytes
SHA-256: 935db1c87e0bd019fa4c427b160c2324c53fd82f3b41a63db7d3b1e03d72f0ea

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