Malicious PDF — malware analysis report

Static analysis result for SHA-256 7831262a4b87f84e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 08:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f50a95276dd6315ef5cf45ec0cfa00c SHA-1: bfc1957bfb8c7c3bfdf669f520a8563ae35c56a3 SHA-256: 7831262a4b87f84efde94e3a2d1c945b5d81a4b532605940ea033697c72b15b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as a lure to redirect users to malicious or phishing content.

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09087c02f2---ziduzobidukuvunajetisi.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/30ad4a2e266aa087ca4b192684584fba/tajezomidabizudaz.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/c95rnc8gcusgkhuu228t79nd55/memik.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/goxinadu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607576cc38216---bepotaselewadoz.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/54632579021.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1629776974pewubeteduwixozu.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/tajava.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/59882246314.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/fizirogaxisinomujujora.pdfIn PDF document text
    • http://intergeored.com/upload/File/6023381356.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/gifonawukuwumixabuxu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8a5df970---71689877345.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/49682689465.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kapaseb.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vibixanot.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/87351358677.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abc369c5a8e---lofeparalevujuje.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/zifezokuxo.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/cf62734872d33af57b3927686c1c1ed4/78322194814.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/472133841.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l8k6g7i7dqvaceba50tdbohct4/jupimafifexexol.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72f19d64dc---sinawotevopodolodujimaz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0b7a4e41cecc0a480b373c99c3ac119e/zatesisezobezobufafom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=forenoon+meaning+in+englishPDF 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10436 bytes
SHA-256: 1bde88eaf9904b88ed1aff63143ea1613bb0c0eaab0d5c58f630def576a04912
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 21592 bytes
SHA-256: 14b5a99e6a11a3c275f3bef324a7d1060ae275f6d6ec89c1aec1469244a18579
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1