Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5dbc3d5d8c1a8…

MALICIOUS

PDF

70.3 KB Created: 2021-10-10 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4051ffa705164a41f544c4304e516714 SHA-1: d271d53cd40dfd0915a75896822a1aa8773e79c2 SHA-256: 20d5dbc3d5d8c1a8b29167c4e68fffecc0e09297c76fbff39676c4f30133001a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=meaning+of+depit PDF link annotation
    • http://sportingclubalbinia.eu/userfiles/files/vokos.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/powibabuwevitagofow.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/4732778772.pdfIn PDF document text
    • http://mobitransjogja.com/files/vekiledewemugigopitixepij.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/3051104302.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/lojejelesivebokewudaxapo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417a115c494---81864873880.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/numuvubisogofogosuma.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/98139546583.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wisog.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1633522684rZe7.pdfIn PDF document text
    • http://360global.ca/userfiles/file/65669576007.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d185011ae---23413549588.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/62ffd7c30b5b651a2056a3b5e58494cc/noxixepobumud.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/23630405216.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/dumutenunemipiwavubeb.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/topawutekonajugipopoma.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/sewegatezagifesezi.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/lawuvorezi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/tadopexifibu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615290e0a7f38---zegijukuvule.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0490fc92---12369565659.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58296522273.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/xetepimulixibobe.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_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 10352 bytes
SHA-256: 7d7360ac3c2b0a8878b58dc32b1d4954eb57e181f2e958af1caa33fef4056bfe
font_01_sfnt_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 16876 bytes
SHA-256: d818d4228a477eca377d5143c01afb2f00b64f402b6c4d1c252885e0217a5b9d
font_02_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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