Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dd0185904da5ca…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 01:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8879101879c00413415c83bbb92ca606 SHA-1: 5c136f4c274d1b45fb52823ca91ed3e63cffd221 SHA-256: a0dd0185904da5caa3af2cd277fd36417885375da336b319e59ca73d16b78d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=the+witcher+book+series+epub+download PDF link annotation
    • https://foundryindia.org/userfiles/file/kaparipobom.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a132d919---84947295632.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/wiwemarowenap.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20e265d62---menerororeligeli.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2f12710f78af934003cb3ec20f0fe12f/89346744183.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/97164354587.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/36268327646.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/tapigikezefaf.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/fomiraxokop.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2689b723---sokuzilogewul.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096deb70fbf3---gaxenu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/nofusegeviboradixiveb.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/woloxeniro.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/15695279084.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/fexuzalikeralumo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/touivg52h6ossgd67rt2aabklt/tusot.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ho0do1a74j71g7d0a107ietasc/1202860460.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2fb1ece3b---zilukefakexomovurulupebe.pdfIn PDF document text
    • https://angem.fr/userfiles/file/birowevilanubovobo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bolowub.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210823184410_o04v6g.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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 17588 bytes
SHA-256: 72084f2976a50fb904dddfdc9ad97bc31e0f6aaf0dcf61054b77bc643b19afed
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10992 bytes
SHA-256: 7ee5476e68338c1051102920d33fb39105b019aa1f46d449f1b754bef403696a
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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