Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a13dcb3d97d6fd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 04:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2258d1ac4e7ac45e8741a772275065b0 SHA-1: a37b57d587a4c06e7d0e0b55c10c46a925312fed SHA-256: f2a13dcb3d97d6fd82ad3b148b765c6a4841f70a31ca6927b0d4fddc807d2962
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jackinthegymtpe.com/uploads/files/202109092248596869.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e8f35041---64864391273.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144afc7d61---15709528728.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/77814788730.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/31925074666.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/sabofogegosoj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142cce6d7679---xamesuzijowedopugux.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/95265020848.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/3607401197.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/69882564356.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/90904170664.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/1317888377.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915153500.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/samunesusulanukobaxigis.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/jakadesururij.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/24638564133.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/tukisizumujezaxex.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/1185016537.pdfIn PDF document text
    • http://sin-hua.org/userfiles/73585716344.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e335536e00---94643290200.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/71962137162.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/59389838968.pdfIn PDF document text
    • http://henca.com/files/details/file/40982121589.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/levopumanabomuvomofut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+king+of+fighters+2020+apkPDF 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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 17944 bytes
SHA-256: b9372f8bf1b9bd7b700934b9cbde2774853830747d5d447a3d84b5fbda1261b6
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10888 bytes
SHA-256: b027735991a0ab5473cfae77e28b8ed065de4adbcac7c69c0c3ee5b344f79c57
font_02_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1