Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08a85d6bb2a53ad…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 06:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8492a51ced017c041fe61337e12e341c SHA-1: 4634882657dd2d66aaf183cfe3b8981648a38c43 SHA-256: a08a85d6bb2a53ad76d6b781f60a4d1c89568b80704303875410ebaf0c934b66
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to external, potentially harmful, sites.

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://kovrdom.ru/sites/all/sites/default/files/file/gowovarod.pdf In PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nikanapiwubo.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/wosejile.pdfIn PDF document text
    • http://exosushi.com/uploads/files/39109719608.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/jopegirukigegovul.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/xizilakavigujatugipemivu.pdfIn PDF document text
    • https://europartner2.pl/uploads/foruzosotewuxilomitemeles.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sewexinodado.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f3278b30---senafudobon.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/70866558033.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/99336482764.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8f1153ac---tawulasuboni.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wujejefoba.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141053abc252---fexenipexonugimuz.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/83761343086.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/99004374903.pdfIn PDF document text
    • http://punaide.com/userfiles/files/nokopoka.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/jipimigixoxuj.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zexevejurevawuxudap.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/6560240352.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/21977649639.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pugarozagumupi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161374e333af50---81865689192.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mr+joe+b+carvalho+full+movie+onlinePDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 17936 bytes
SHA-256: 5fbd786ae76e9c9558cb6c0b70edeb7799ea43ef30b15cf1815d083772e85494
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 10764 bytes
SHA-256: 7ad89b74bd988f4a8e1323edea835a5ffdb2cbe2841be956267027c080e20acc

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