Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50883fe5b85b6bf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a989df2d4688ea7d3d55a4803aed11e SHA-1: 13d91af10f26182043d79f13974d970b1b692856 SHA-256: b50883fe5b85b6bfd311a8d4b7fb83f1c46dc9897c1c0a5c6cbfd1592e1b4888
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains. Heuristics indicate these links are often hosted on disposable or compromised infrastructure, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=krunker+aimbot+hacks PDF link annotation
    • http://dj-maily.com/uploads/pages/files/numototigafa.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45097832785.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lisabarivigikaxevejevesik.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/sekaxuvoz.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/61812996974.pdfIn PDF document text
    • https://datajournonepal.org/files/22816742295.pdfIn PDF document text
    • http://checopharma.com/upload/files/67636725194.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5b0099d9---12960035866.pdfIn PDF document text
    • https://teamcode.net/upload/files/xoxajosegilinewurafab.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/87408855245.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/ruvaj.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/49428719941.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/13717325397.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/17880180993.pdfIn PDF document text
    • https://defi128.com/userfiles/files/69128899799.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/83246610831.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/7599910406.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906165247.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207fca7fca---85958242560.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vopev.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/46853964663.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/tidonidurusanafisakoxele.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/51234260293.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/luxekiziroworul.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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 17720 bytes
SHA-256: 9fea79d9c0be898eb943e658ca8b68c5f7afaf78aa0dd33a1a668e528898b7d4
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10772 bytes
SHA-256: be727e33792cddce0cb72046c0e64dfda56518fe2b424aef48bc7da5bbaaa83b
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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