Malicious PDF — malware analysis report

Static analysis result for SHA-256 5136442362c1470f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 11:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb294b15cd0b82809f873e8c68fcf5c3 SHA-1: 99b57cb5eb9ac9712ebbb5a6e8a0394d1c735130 SHA-256: 5136442362c1470ff99de10b021d09f79c18ad60d65e2e31df8e64fcabfbe0f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of MFA/one-time-code lure suggests a credential harvesting attempt. The document contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a phishing or malware distribution campaign. No scripts were extracted, but the embedded links are the primary attack vector.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://infrive.ru/uplcv?utm_term=android+on+windows+tablet PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/patuw.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0676ac892---vuwijil.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gm4oitc1c7b21ts34c6akl2qi2/vobositipev.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mimun.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfef3eccd---fonele.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0ad771db---95068351064.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/26426956343.pdfIn PDF document text
    • https://proia.bg/userfiles/file/77567217810.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161394933b905e---farusaxupuzebikana.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/46210607811.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/vugemetudomidivu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/lavasanigaruwivanawigiduv.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tirotuvajelupexeb.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/tuxarologew.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/76150693521.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gevures.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/39648948446.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/79173111753.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/wibitogipaw.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/mipuxoradavijejovaliwefi.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/xukesamulotimu.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/63461898450.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wawukukobavubadatojem.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 10448 bytes
SHA-256: aa716fea2a38af4c45b9b55dc3c0dfa729b3764729d1321a64de62811017e210
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 17996 bytes
SHA-256: eee1346c86ca16a9d53b2499a67bb5b1ac477aea858243308c22be4e99c7bbf4
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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