Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf622cab6bce00c8…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 12:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91043f467fd3381c5189fef14f06b790 SHA-1: 4a220b8a61b8d7ce6bd39297fddc074a94ec68e3 SHA-256: cf622cab6bce00c85d2c2a34094f47b90ef0ba04ffd7d81b0432fe1c3383314c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and executing malicious code. It also features a link farm pointing to compromised WordPress uploads, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=how+to+increase+yin+energy PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606f363fb7958---43522961710.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609424d8602c4---xazod.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73538dd66---sibisix.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8eb137c8---26257163799.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/195057343960967bfe4bb0f.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/73847577267.pdfIn PDF document text
    • http://huntland.hu/upload/file/77370551179.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/fawifedafebakokesiwu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/bojewixasumuvup.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/magilo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/no3p2oo6k9nrnu9cvcnhsktmqi/66401958727.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/65506788093.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f26538c0119---19388938251.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16711118450.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/10112599353.pdfIn PDF document text
    • http://tencanpowder.com/d/files/jizanodogil.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/kuvomama.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c30ff3784---mawaboza.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/3348435835.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7800e68c541430d4888654fdc0ac23e9/27637208954.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/88663810961.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u5fhmuq29abdqt638gefoqigu0/rozozugibikiwu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968bb79800b---75260007347.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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10548 bytes
SHA-256: abfd95f9df702674bbaeb3900f8f67564fab687e7ec235b3f37314306d8006be
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 16884 bytes
SHA-256: 2370e5b4223088aa5aba51a2cf4cbda06048cc3cc08093dcb5177a7e47633bc0

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