Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb8ceea87629480…

MALICIOUS

PDF

78.2 KB Created: 2021-06-20 05:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 058b45f6bca6d163c24c6ade2f72b717 SHA-1: 482d729441129c5063ec93b1662e07edb5504de0 SHA-256: 7cb8ceea876294808619de0668f5a9fd454c314eb0ef75ba8dfe43b2fedea516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body contains garbled text, indicating it is not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afb7a99fc---dazatibaparaledov.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dqlfma82il4ki70ikf1mohvv36/ludori.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160beb917b6869---wokebagubiwobokojida.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796de68f876---jimake.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/80ce4befcf38cb6f050a43f58a6d7b4a/jajizip.pdf
    • http://esthebel.de/userfiles/file/xozovuxupumila.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bcabfcc8---66798449067.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vasizirabegewopita.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce461f238e---78899431256.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607260f5bcb54---98316645102.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c49787e2a---pezijewojezekukejudilemek.pdf
    • http://bachova-terapia.sk/images/file/vazuxilavela.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857de2d5f88---27813499753.pdf
    • http://usaoxin.com/userfiles/2021-5/file/42444939904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stardew+valley+mayor+lewis+shorts
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df71.bin
42f312b5b23caaefb02a6190e99fd573e41a5dc475d7bb2e84f73785f8031c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 5424 bytes
font_01_sfnt_off0000f1ce.bin
6c90e3bab5e9dd807ec98c60a2c75192dfc8e3b3a67b74a11142a5269c3f9ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 10608 bytes
font_02_sfnt_off000115de.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 16204 bytes

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