Malicious PDF — malware analysis report

Static analysis result for SHA-256 17822a40925a7269…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 17:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc84490db7a747b29c41546071f4e704 SHA-1: d741f9b6a517a09e5e8a7c206a0f67251447828a SHA-256: 17822a40925a7269fd7f3753fa3d7f34b24e91c87f57429e29366c0f241b5508
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, 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 links, including one with a 'utm_term' parameter suggesting tracking, points towards an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=ios+spiele+auf+android+installieren PDF link annotation
    • http://dnt-mayak.ru/content/File/tumulekuwadajizirakev.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d0e5f1c---33919037053.pdfIn PDF document text
    • http://www.puhito.hu/uploads/65292880118.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wijufinomafesubikamotosu.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/kifekudenajijijimibogex.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nuxawunidapowizejeratun.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xixizexuvozuvumumivufu.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/suwesopixotofipizuw.pdfIn PDF document text
    • http://esistore.com/userfiles/file/36555278805.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bdba4961---51824883198.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210916_d5387.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/zeladaluzaxuvuvetade.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/xadagunefosijoduzabupal.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/95350665636.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wolawinajebagatuxijese.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c59b7a23---pizeviranabokix.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/32742545157.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/fawunulat.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/pevegufajenotiruxez.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/3300632811.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/90033984207.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10544 bytes
SHA-256: 49769ba4a78432a5626731493527c7a375152a21e21e8e37816f14b48a27bdff
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 18764 bytes
SHA-256: 3d36c92e029872317f06dba4799fb58ddd6e4ea102b1ac028067f97d24cad759