Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7a1dc3c47e2e85…

MALICIOUS

PDF

93.6 KB Created: 2021-07-03 16:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b70492e8dd90eae5eed050354b3362d SHA-1: ec993963ad870c24ea9e294a464d9438c0e0207a SHA-256: da7a1dc3c47e2e853aad574cdf7301aaa1f0656cbe0c0f2e01d3bd97f157141a
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff39f79afb---dikopagubojugovolamoradil.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/gb46cqvgsoq9gin4n28ha026s4/wubozubatomogape.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5a20e71e96cfecee676c0f16309c5fcd/jikobujapewajobanovimi.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/08c0f20a81914f3c50e964ebabe9b4f4/zadot.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7581efe9---92975632938.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b25549f2a---43532145230.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/s77ol5cl7prjhh9rqd6cn4i19l/84129590285.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce724f177a---fosenavugijudiza.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bts7vo6ftqjn0mob4oemed7pke/duwusijiduxirig.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe03797d61a92f442ad0a717bb89e2/88964330064.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/25945064448.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/fitexoruxejan.pdf
    • http://hoangle.vn/uploads/userfiles/file/juvum.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c17a00af---ruxezofebebeset.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec3484749b---luzifegitimufir.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd68ff317f---fajowubixefeletene.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fee41c721c2a10939f732c9b38981977/tajudinozojobi.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7efd0ef1addc79fc89c05b87f9f19b7b/21123821407.pdf
    • https://rybczewice.pl/userfiles/file/bizovumijegin.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6683e1cd70---61112761729.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738ae375b9---wigikaxirovemaxori.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609643c1a5211---gamatupobunej.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/lanefumowukebiko.pdf
    • http://dichvugiayphep.biz/upload/ck/files/vupepokisufasud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=things+that+rhyme+with+jamie
    • 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_off00010504.bin
2ef2786d0826f0e8e31157f610814f1208473ac4249a19a55c02b07b83ee6100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 19568 bytes
font_01_sfnt_off000138a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 16792 bytes
font_02_sfnt_off000150bc.bin
f4f8e92573f68d84229be22e68be35962ef6bf4f2e17d8a0ce08c3a4476a518a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 10684 bytes

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