Malicious PDF — malware analysis report

Static analysis result for SHA-256 a096af8f4cf987f3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65c499fc1b0fd721ed078a49b60a54d2 SHA-1: 62703f423244cc732f7cf7ba1e08ed813f28ba5f SHA-256: a096af8f4cf987f3eac6e0dcb80779102a3943fa804ac9a21b1793e46ef7618a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. While no scripts were extracted, the structure and heuristic firings suggest the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dzido.pl/userfiles/file/wugunovexekadagi.pdf In PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/48854735364.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335b8f7a2c5---boridetanevuwugi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1c18383ff78bf4a41617d1be468cc806/bapupenibisawapu.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/veruwawesevezebu.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/68088864708.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/93630449713.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/remerisiji.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/womipoludodevozamijitowom.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nupanibun.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/wisawinajazelusafawel.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/69727339124.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vopozavoxavo.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/37054012255.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/63796340946.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdc87ab38---minixopadokakez.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/fejozipedoliwedeniwoxufek.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/28987948981.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/gofolefuwafekuwipibapel.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912044927.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t2l019bcrprq9bo95rgjafc650/5757683622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=realistic+physics+mod+minecraft+pe+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/27358616701.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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 11132 bytes
SHA-256: 61da7bcc28fdf92b36ef6e4445f1eee95847097c561da1b7b2fb3bf0925996fd
font_01_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 18028 bytes
SHA-256: 82c8ad3e05c2b44bf62b2402bf58273a19ea64c2b179548a118c0c0f07a04471
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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