Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddbe85eb3d97670…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 01:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e092f2840289f581dd87526180dca7a SHA-1: a88662d4472da44b920962aa4ec6daa2447f2205 SHA-256: dddbe85eb3d976705636397e8898f4e0eaed4e737ddeef64d4cd39062618b7ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://samavetpharm.com/userfiles/files/rorisegawubuzap.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/kuxizuborapemebukimuzibor.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db7092e33---80063786446.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pulomepimap.pdfIn PDF document text
    • http://elitacasa.it/images/file/moveri.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/70896072451.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/dutasuxerawomolole.pdfIn PDF document text
    • http://atya.eu/files/file/89325406847.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/wibosubofugotexofu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xagumubuv.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b236b887939---refoginas.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610401c3400de---84975950261.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/tozebuzila.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jusokunez.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eac71ea89---39141343222.pdfIn PDF document text
    • https://airbays.com/userfiles/file/mezizorusotis.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c1a6d21c9---fawax.pdfIn PDF document text
    • https://alpinashop.bg/files/jiwawuvagopurerelawized.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8a8a976daf9c2eefdcb318f04647d26e/34527241468.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/rivitobaveril.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/37089258013.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/nawilifenuxuwusojaxukor.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/pokuredawukanedowixila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=converter+ppt+to+pdf+online+freePDF 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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17440 bytes
SHA-256: 43c4b408e875f824fc472cbc1c657f7d172a203144f4cb9df789dac7a551fa18
font_02_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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