Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8787a22fb704d77…

MALICIOUS

PDF

73.2 KB Created: 2021-09-29 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c74cfe1c058e7529a076088b2f1d84d SHA-1: 9b814c93d20f18757205e2b69dde7426ac2b9abe SHA-256: c8787a22fb704d77f9307a2c51dc6e0ae361d6cc65a6f4b6f899f36697939ca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://crysiq.ru/uplcv?utm_term=iflirts+hacked+apk PDF link annotation
    • http://winhazel.com/indigo/ckfinder/userfiles/files/93080336541.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/89354817016.pdfIn PDF document text
    • https://kimcert.com/E/file/77525426144.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/kuwaletemerupaxotaririb.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/77256916139.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/vijafovenuz.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gimanube.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/62578332165.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133627d70d2a---93877184709.pdfIn PDF document text
    • http://stroi-sistema.ru/img/83538205916.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tavewosawe.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/xivewomur.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/takow.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a71558dc2---40316364188.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/xejibinumubusodusi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/bekizodiruborusepij.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89415749448.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/33124573643.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_82308A699C04AFFD.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vaperuvi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/guaihj9upfafv4isd0qd69g2et/57776407132.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/79993556417.pdfIn PDF document text
    • http://esistore.be/userfiles/file/42074942381.pdfIn PDF document text
    • https://cope.lk/assets/media/file/68217629725.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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 10536 bytes
SHA-256: 11143828da4152d7d1d95b8899a50006add1bd649f5558f2515d06b44259affa
font_02_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 17940 bytes
SHA-256: e779d0c348b763a499c7b389d536ac8958a9d92cc06bb103333951b364b973d0