Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0955581d8660aee…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 02:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b75b0289000cf7977294f35f7825d8e SHA-1: 1546b3941dc7280fbcad3e80864fbf9c3ad9e498 SHA-256: c0955581d8660aee902c3db1a182b21bc283f855eb9e3b786d2fab0d944c42c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it is designed to lure users into clicking malicious URLs, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dasbluemchen.com/vovadexerufezetipun.pdf In PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/84489701149.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/8461262726.pdfIn PDF document text
    • http://co-mit.com/uploads/files/minunaxogevadigelevukoju.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/83834576347.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/1803158609.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/jusujixifabebugetopo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386373d01b8---wipapagiwivupawipi.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/powesetexilejoxoboketeji.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/49460604900.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/rirafiraben.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/linatapazuro.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902011718.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wafozeji.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f5b7c0d876d4e70602ddda1ac21ee697/96502236975.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/jizewobokuwikexe.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/pusukazuxoremagukemaj.pdfIn PDF document text
    • http://master-vin.ru/files/file/zedajebajetefevoxitawe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6f109b18---sivifetanuboxoxeresiwo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7ec7671c44f30b8f48a860cc05b1fe9b/51329877496.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kodedoporarew.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905130919.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/fuzaxuwalofuwovewaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+games+best+2021PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/55859720074.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10960 bytes
SHA-256: 4bbb22cfb6479d57cf0129ad33087c09d6b92593b84b13675b328bd246de16dd
font_02_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 17284 bytes
SHA-256: c62c7b764e8fb8fb2ff27a7348025df2ea8afeaa0d40517000aa0631aa052e31

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