Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4f73d1a5a35e6d…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 22:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbb1606440ba091c7f3339afe477b61c SHA-1: 9e9b7e986a850f0076b71aba0f284ca945084d64 SHA-256: ef4f73d1a5a35e6dafe7d8e5a4e297ed5eb5eeb2e1051375b612c3484d88e989
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://a1-automotivegroup.com/upload/files/9403813591.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1632232127.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/pevapajuzowal.pdfIn PDF document text
    • https://anup.bo/images/files/rukoposovelewelifinu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/fevawezeriguzoduwe.pdfIn PDF document text
    • https://inarsindbari.org/uploads/rotulaputupatixo.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/famalixofoxumuwu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128117ac89---sujafijoz.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/27587920055.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/zizuganapu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/94191436683.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b1c194d0ede430c22a13e735e349cd9/22851618812.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/89950586133.pdfIn PDF document text
    • http://minipit.com/data/files/kisepi.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/vuwopirawalonubixed.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/71410129682.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/jaratejukimubitidazekalek.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/10552496709.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q74e020q6adealvueljspvfh5q/loxoruxukarumududisazisi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/selesisi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/xoselenasoxatuva.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/japilejalasituluw.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/rulipomagabonave.pdfIn PDF document text
    • http://schokozentrale.de/idata/74458626029.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/koviborevixesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=characteristics+of+elements+and+compoundsPDF 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_off0000b429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 14892 bytes
SHA-256: 21403a9fed3bec66fc7ceabc9bb04484750c1430ab1177ff1893bdb9a3d280c3
font_01_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 11016 bytes
SHA-256: b9df860fe40b5002ebf35a21a2ef50dc20ad864a02fc75d474f3ae0f5c71a5fa
font_02_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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