Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2b1e86dded3de4…

MALICIOUS

PDF

94.2 KB Created: 2021-07-27 23:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b26ec177dcbdc2645fc7d62a542a6d1c SHA-1: 09653bafbc79df1bfe2c9fd2631dd26a890c5d12 SHA-256: 3c2b1e86dded3de49201c50c8af8b116dd699fbc5d5fbe2a00cbb47f65049258
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm likely used for SEO poisoning or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/654d6aa3668aec7cffd97ccc1a06faab/31903996335.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/up5mimqurhs48qq9a66fpkd355/begebimobipun.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4b7936cf2657953a79cc56c05262829e/makuvedu.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mbo5t3fv04vm9ipejirevmj1kn/vadimoduzu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c21d43dc---84475952858.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1f04eb5a---20095925993.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/eia46a28v5nd89p2tbmgmn51th/batukilobakoditisowovokip.pdf
    • http://aryajob.com/user_upload/file/reselutunojemerig.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/9523559445.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83508dfd3---kijawaxopov.pdf
    • https://betenrealestate.com/sites/default/files/file/lexejagorinoxenadigifa.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/53813589221.pdf
    • https://patc.fr/imagesfile/vuximugozurumironumu.pdf
    • http://styropapex.pl/userfiles/file/89571326321.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6c1dcb3a6---86245607871.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b948614a625---44964034232.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nh17jnmigcq0m8te56tofdhejn/21763507189.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/rujilexerujevuwikanis.pdf
    • https://tanthueviet.vn/img_data/files/38640840016.pdf
    • http://rotarylaspalmas.orgdocumentos/file/3437162171.pdf
    • http://k1a.ru/images/files/file/renumon.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607282fd6ee45---88391714758.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkspf9oalq21agkol8ubk7o2kh/24614266131.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=battle+games+unblocked+at+school
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bea.bin
a45462f0f617772257745bc370072d50fd91bbad50156d91bfd9036a2f0d781c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 11012 bytes
font_01_sfnt_off00012537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 16792 bytes
font_02_sfnt_off00013d49.bin
69ae757b4dd759d3ccd268f18d57a4d84bbb62d845c73f40d39dd394b80e78ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D49 17168 bytes