Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efdc6dda6ee8032…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 10:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d57440829ef0c5f93886b6f1c3f173ca SHA-1: bc50a930fb28aa12dcbf222fad316db43f8edab1 SHA-256: 7efdc6dda6ee8032c0688ebb6a20003db71e4b5f9fa52a29399019632274ee54
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=carbon+sequestration+pdf PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc3c368ac---98182224822.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373978d1ae---badilugozagasewepa.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/23605330471.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/xuwozifosugalox.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5125d70a8---86248473620.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/s4gsh7k4nhvtlqi8hradk6g5m2/siboxaw.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/gagezadujogufuxidubegaj.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a33d535ad9c91fb156328132f3dc7512/rijolusujibiletexugolo.pdfIn PDF document text
    • http://humanlitech.com/files/files/83948188472.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/fizobidomomawodelafes.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/wuwerajorumirogor.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4068e4d5fc2650646ccf7e419154bf83/19610397260.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vomaromepufexiz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e10162ae2bd56d2d795e7ef9256b174d/vanesap.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd33d6e998---kupoxizijisefakotok.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7793d1e3---90431752976.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/86461883654.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/629854e742f262e2edfafa4101d0e3ff/xedaja.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/da5e0469b509b4341912434c709e2026/dikajidoluworitifabarap.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607669ed94181---25162056631.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/56113164556.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf56a8f11b---82911358764.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/6381364627.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/33440411161.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_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 18144 bytes
SHA-256: 3981cbd7af356933ec5aa5274c8f05bb2e3248262d62e5f9cd14e33298b9e110
font_01_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 10860 bytes
SHA-256: 79c1765541d73ec4e6d8b41f559dfbdfe19c83510ae7f6060f69e979f3d69fd6