Malicious PDF — malware analysis report

Static analysis result for SHA-256 756b0c162d3895ae…

MALICIOUS

PDF

171.1 KB Created: 2021-07-20 15:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 169ca3dd4e7c202830cef214a74b2c3f SHA-1: c0c17936a5d1e56b018f46cf97525912860f0712 SHA-256: 756b0c162d3895ae5244d009be85573de8de7e78d782128a2695b9a9801c1104
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9103

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4caa884727---mirileporoz.pdf In PDF document text
    • http://crmrealty360degree.in/userfiles/file/lepopodaro.pdfIn PDF document text
    • http://splogservice.ru/content/file/mapufazu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/61694377986.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd35bd6c8---bomijilerasug.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/9754004556093228eef5d2.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/969701679.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/rivaruxaxabigarasoxas.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9e843d03---bivajamapoza.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/he12site8bq9i0sqd5v9p0bs17/lawufekibigasopanilupunuj.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4a2f776e8d5aad31af411e9cd6a3c672/zakageraben.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e814eb77276---wosoziwek.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/tuzonefutotus.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768c69e195d---dozubixiwikurizewumoserem.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51691587795.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/e6jtshou1r88ibu9poafopoeb5/79385422589.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xikewo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608110f719764---47132833470.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f771e64d9717d336b1564b7aa76fee67/60941681924.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9243vmffi2cglhece0m53iaad/71945264431.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4c1b3cca085b94c7b26ad0286fcf93a3/90989524171.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/f5be56b0f8e282534312694a89023247/17118063969.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d98dcfe87f9---rifebujijasax.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d13760f6---76661257876.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/mabozamugugidepisif.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/tazixon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=all+promises+are+yes+and+amenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000214dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CF4 10548 bytes
SHA-256: 584f2c1de936a62b5aaf226451971a75c05f062fcde9da46e28a14447626c95d
font_02_sfnt_off000244f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244F3 31268 bytes
SHA-256: 3386968ed06988e4df020c9ab9ed4e06a12a869dc742cea28f362389802380c2
font_03_sfnt_off00028648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28648 16680 bytes
SHA-256: 260b1ef609bb7d14246a0167a2a990cbe6871383563ae80893bde4ac68f42e19