Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f63c887861a38…

MALICIOUS

PDF

66.7 KB Created: 2021-09-20 22:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89b4f9293ce433d3d5ae4f937aa22312 SHA-1: dde739b1552427b24c7e66195eaf63adb847b9c2 SHA-256: 8b3f63c887861a385eaf0eb35c8d99e199886782a57060256ad08c3931dc1b80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking embedded links. Multiple URLs are present, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted, but the presence of numerous external links strongly implies the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=need+for+speed+ppsspp+iso PDF link annotation
    • http://vnndt.com/Images_upload/files/xuvasiz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9268676c---15954364120.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/67246304662.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/04dded3120b22ddec4f8cdf67c42eac0/74645929419.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/laxejijubo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/55193359927.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-5/20210905184558805574.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/guxizuruberovoxiri.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138127d8076a---ximexamanowepaw.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/dusunevetelux.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/75069256823.pdfIn PDF document text
    • https://sadex.pl/fck/file/zelazenowilebow.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912022703.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/82332444489.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9fd5aff32---kaniti.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d77de838---vikevetidejowosaninojonuv.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/zenexuvebovikibej.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/kifiw.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/34222208480.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/kutopefusiz.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/67216521670.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/rozugofujexosakuvu.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_off0000acfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFE 13948 bytes
SHA-256: 777ee5998257751ca7e16b14f92fe5067d1a97cafceb34f08fbe751e9163d7df
font_01_sfnt_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 10056 bytes
SHA-256: 945957d7f7c6bdbb40f021b766dd1536605e856a375b2dbb2317b2fa9edb539b
font_02_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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