Malicious PDF — malware analysis report

Static analysis result for SHA-256 39963d24a52728c9…

MALICIOUS

PDF

91.5 KB Created: 2021-06-26 08:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c72ae151ae430370b68a32c8b71fa712 SHA-1: c584c8515bcd3caee907a80a22bf9f53cbec0e45 SHA-256: 39963d24a52728c92ec6647bb2be5df86a5927ec15733692e854de991d73bedb
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, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be to host a collection of links to other PDF files, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/54t1b663mlrm8kqnrjfc1nm44e/fufunan.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e96129e4---62390723025.pdf
    • http://wabasnb.com/files/fckeditor/file/83445485960abf0c201d62.pdf
    • http://aklond.com/UploadFilesfile///2021042909543442.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0ue927lec0gjfflpc143fsdfj7/naratawu.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160986dc07d595---kasatenasojokaralapulexe.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8c15059e---pufelurozomubudazezowiru.pdf
    • https://area5srl.it/file/konapemiribilelunugo.pdf
    • http://flightshop.jp/images/blog//file/pupotojajenax.pdf
    • https://fenixfalt.com/userfiles/file/kiwowubatololujixomowaji.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160976ead23193---sazilu.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/26491c146140250fe4b1f3fbe3a512a9/dipevofu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee5f707bf---mesadimedanozuwumimax.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c9d15c3da506e3943bdf28435967c628/zukotanizufuserelok.pdf
    • https://hoalavender.net/upload/files/xebixenovepadipebo.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7tn06v6nh95q7v2fhhapfhb0te/nuligoxaja.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/70fc73090cc0e963e7c6e5e5f1b2b733/rawosaj.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/17458968285.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/41e1eac1e97b080d795d588eb0e429f0/xorudaji.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c791d6e0d2e867097433156d33f7894e/83165680437.pdf
    • http://catgarner.com/clients/873270/File/minupo.pdf
    • https://anandamsanyal.com/userfiles/file/levabosetujizuvoganogu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t7oklqu621huq8vp59gmv9dmp5/disatanibaximovagate.pdf
    • http://garmagostaran.com/Upload/file/31734786364.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+pruning+in+psychology
    • 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_off00010399.bin
17b99fb966033305639696b7b4493855bafa5fa2942e369284cfc066f184bc76
pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10728 bytes
font_01_sfnt_off00011c3b.bin
15e8bd14095bc9a043aa32efe2d6b7443131e304a26ea7acb05ea4f008b9194f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 17096 bytes
font_02_sfnt_off000148d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 16792 bytes