Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c2d3a27a8ec818…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 22:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c3e5916f2ed91c9c07c1872baf4e4b0 SHA-1: 456e86c98d912ad43fa2db67bde55f5d411352ab SHA-256: 04c2d3a27a8ec8189007c3ade53d22e73b2afdccf3aa34a7936abf50202c7976
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0865cef099cfbae976069f0aae6513d0/bixiner.pdf In PDF document text
    • http://sinproval.it/userfiles/files/28578653557.pdfIn PDF document text
    • https://mihalex.by/files/files/mefiripa.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/95340500761.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/70985459.pdfIn PDF document text
    • http://hk-keber.de/images/file/giloketog.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/raranadeduvibiw.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/davisubukerifidopeg.pdfIn PDF document text
    • https://o-dance.com/upload/files/30573966921.pdfIn PDF document text
    • http://prograsifkalip.com/files/fisarilifebodazarega.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/jawilimanotofo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16099215fb4078---vipajadesire.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608705469b162---86548990243.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f668cd2fcddee8b5305768de48e21d91/78138140552.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fodaguratudidunideputaxun.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/23125467973.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/rerumaton.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2b92689e755b708ab2616365feca0b8c/jawiwizotafubazosepanilu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6651be6eb3---labofavogupuluso.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b144e687f---96637383304.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/xeduxitapufifolabujeputej.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/89189909637.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a229a71e973---jefolu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jikesimumebo.pdfIn PDF document text
    • https://purefeeling8.com/data/file/dapevonade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hp+probook+450+g4+specifications+pdfPDF link annotation
    • 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_off0000bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD38 17700 bytes
SHA-256: 9a891fb97fc288f056a8f1a4d049c1f7072e9a73c6cd6010caea38ba0abc3964
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 11304 bytes
SHA-256: 1a38cfab5e2b2c9f6b0f424cf0b1bb83678beb2dacf8d63d9a3d53df88a612b3