Malicious PDF — malware analysis report

Static analysis result for SHA-256 460c4abb8d617da8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 12:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5620f6cac0b4bc9088adc6151c9ea424 SHA-1: 03ec8d3b799d35ea76b18d2ec5bad47c33295dd1 SHA-256: 460c4abb8d617da85fa19c94cef815d3e17bf5f8277143b8a6503871a6f5e697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cflds1hlcqsss9i6t3cebi3b66/1264981366.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/91efc08d6ad561aace1521d21d769c95/28328724456.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/17849364592.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/70881500461.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/gukevujutobebodedelene.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/40742635213.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829772dd2e9---boziwowezafuxesufin.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160963c3d38793---27702051770.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/476a8df4c281af2397e56e09dc1b699a/97340128507.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/69917317938.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107122308441056.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/45940320872.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f58db83ee5c0b9e7e34201c85c5df486/vevakejijibuvapi.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/77034365855.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/lifurutabibuga.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/73070037880.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wogaxurexasevafaner.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/f6ron3pcg8q8ojr24o9j8ieqt8/54090880679.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51e0d1886---4258977710.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/jizopokasepifizedekaki.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021618756429747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+present+perfect+6o+primaria+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210821/16295406174016.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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 17844 bytes
SHA-256: 6f1dbc8d699b2fdd261744e73a5dff05c3c3730123882076ca102882f29e675b
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11016 bytes
SHA-256: 8afc10c1b23edbc31765bb570ce3dcc5e7f45405c303aa1e4ed69ec94818e185

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