Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f59833fe346f3cb…

MALICIOUS

PDF

83.6 KB Created: 2021-07-24 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b59e1525003802775c030f8490db34f SHA-1: 13638c0090665af537d653d10d4bdaee8da33d00 SHA-256: 1f59833fe346f3cbefc52875bbdba1a20743f64cabd48ef3f922bf91875a7814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to download potentially malicious files disguised as certification study guides. The links are hosted on compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://visit-pune.com/userfiles/file/nogirelikejidipesuregisaf.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/787d84dd982ae38ecf5b1318ebb4afb9/pajuzaredipojaj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5651fbac---lolamizuletarijakejosok.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aebf0d2bdf202c427c77d4005bf12d92/wunuzonifapitujuvedixe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9bbdc1ff4---saxotipujezorajizajeki.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5307d73b65---94379337456.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/32d1bd56a8e32158453dd378e1ec9e74/wedosanedozufasorapo.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/21970428585.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624349367132036892.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/55370331431.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b404d97d7a9---94315736187.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/80110461529.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c966adaa4a3---vowajelejegawexetirasasa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7c6c053d---12402682204.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160791a6abf1bf---38742970941.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/87280594054.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/katasufiremobomoteb.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/kezuwibegetijosevukeb.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/17936693670.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9564ae917---21086834959.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/dolutejorufadonawinawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=comptia+network%2B+n10-007+certification+study+guide+free+downloadPDF 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 11644 bytes
SHA-256: 54e4f42ca27de1334e32f7763d6e903a817bf57887489d82737077a279a425c7
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 17308 bytes
SHA-256: a88fc63bb5355e8fe0f7779d62898c0fe964fa56c79ec58b713d1cecc257a0a6
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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