Malicious PDF — malware analysis report

Static analysis result for SHA-256 89871328efa823c1…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac4f2d53a9648549f408b315b5f5809a SHA-1: bc22fc937ea13d58e1d7462c69a90b80aebc390d SHA-256: 89871328efa823c136d317d9c84a01945d685fbaedc6e5397fceb3a8e0cbcdff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://philabc.ru/uplcv?utm_term=manual+de+casio+edifice+efa+119 PDF link annotation
    • http://zoltysnieg.pl/pliki_wyswig/files/71551996751.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vudexopukuj.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/wamatokefuwipokaz.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/80737073849.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075e731edfe9---38068003676.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20217262029382370.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/wogibopilewufadajunavo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/pepogumumutozunevebike.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b536f8f375---27367658278.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2a664de---jupedukegolejuwevimiwo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/diregemub.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/72960545949.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/16081625055.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6b796252---44751581005.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jemurozebonazenesu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xegiwopegufuvutoxodefi.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/rufokeduximagosiramup.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/sutorajida.pdfIn PDF document text
    • http://fygl.net/uploads/file/061143063620.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e181152a---46605279158.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7175f322---25254228461.pdfIn PDF document text
    • http://nova-auto.com/upload/jusemupifibabusag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 25904 bytes
SHA-256: e839149c6eef13db9b9b103e0f2704298473b54b35763d438b3477a6fa6c7c3d
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 10584 bytes
SHA-256: fcc37c6998f4c1836af5f4f87fe0670c3c5990ffd0f4ef829e2addb8230d440b
font_03_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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