Malicious PDF — malware analysis report

Static analysis result for SHA-256 041f7d5c93a6ca2d…

MALICIOUS

PDF

106.6 KB Created: 2021-09-18 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4e2017e18d57898a85a50aef6cd9765c SHA-1: 5c2587771d50d12ad9a1da54d7f7befe5971d3e6 SHA-256: 041f7d5c93a6ca2d05b22c756b79c970fb2b28bde6a3521b8e151fab55b3c714
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to maximize reach across potentially compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=mill+principles+of+political+economy+pdf PDF link annotation
    • http://sztarmedia.hu/_user/file/86163486789.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/36899494633.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/611va41hqufhn3d20b0fsk7fj2/firomomudipibowavelim.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/33648508947.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/36990057635.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/50513952754.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sejuru.pdfIn PDF document text
    • http://taxfreepoint.com/file/87900255488.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/21c60256ca6a822d8fd8a8d3a4844fce/kobatawulogitaxaviki.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6a0vtocckm0844slnaf4gjgjb0/30364827162.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41659676867.pdfIn PDF document text
    • http://archbot.pl/files/file/60745919856.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109030825534729.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/96767496815.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/36288336521.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/80470664782.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/91762276263.pdfIn PDF document text
    • https://artbynela.com/uploads/file/69616805333.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/92487804233.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/mewedefekeve.pdfIn PDF document text
    • https://electroagro.es/pub/files/denobubufozer.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/67538603797.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_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 20076 bytes
SHA-256: 8406a05348948210682a575c63f5a8a4c9e0a70206f5abf39e31eb2cdfc03135
font_01_sfnt_off00016b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B17 10888 bytes
SHA-256: bb4ec32d52698bf9fe4e2935d8a287357d69f9d2ccd646adc24ca1f4e5d5753a
font_02_sfnt_off0001844f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1844F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1