Malicious PDF — malware analysis report

Static analysis result for SHA-256 041be03b9186b45b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cccc0183f67a40f4e2b7f347e04d372 SHA-1: 69b7a7eb0a2ef43472ac422494ebc6094a57b3d9 SHA-256: 041be03b9186b45b9f41ba6f348bb30785f93295720350a571ce08e6196d7e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document potentially serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=download+gta+5+for+android+full+apk+free+low+mb PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326205e872f---defotulenusuvizebaw.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/badexeboru.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cc554102117f287512d282bab7c81d51/33080297175.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137adb6ef734---ligupedib.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/dc189b3a3d2121998e54432a3e7836f4/81029274424.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbee1c8955---79910140451.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b44e0858cafeafd845b55c811e847397/tetuzun.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/84765016678.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/88275694912.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bizesolodazobozinar.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/suvubujetagaborarupixox.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xibonolimarepitofipobop.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/49580671026.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/87227338461.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/niwefizim.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/merelekonilorokaw.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58650710287.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/11695069816.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/46304853267.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/mogofurofilenifute.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fowojasirisurenifogifowaw.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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 17536 bytes
SHA-256: 3a36193d105b2da8285b0b8d7f97901173947c6af07242d232d4079e9121431c
font_01_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 11224 bytes
SHA-256: efff84075c9d1ee803ec5f4b5148c1e6aab2ea9f1627745aa02a2af3697fecff

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