Malicious PDF — malware analysis report

Static analysis result for SHA-256 611d708331ac74b6…

MALICIOUS

PDF

77.4 KB Created: 2021-06-27 11:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfc160e136238b36c08e8cf0fadd1d85 SHA-1: fd380f0abde7fb2bb3330c8e5280d67e2189f322 SHA-256: 611d708331ac74b631cf4c925c91d5386b4151df0031041f8c6bda43ac6a6ba3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an effort to obscure the ultimate destination. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly implies a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9d150fdc10cf8e09412572374bd9e4dc/46069221263.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50feb9375d---revepujemu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076e45e7ed47---bapeboxeroxofomefuj.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1edc0f4000---73522117981.pdf
    • http://ktcz.eu/files/files/pixeza.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/xivimado.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/fe0a5430ca7e4f9e90fa4b7b5f514b2f/57315066872.pdf
    • http://vladjurnalist.ru/archive/file/kaneduda.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/96866674420.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284923a679---43219513072.pdf
    • https://cplastik.cz/data/cms/file/31515300242.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7ae6536fcccc9db6d4c1db5b97262b25/widikunezep.pdf
    • https://yellowstonewildlife.com/mobewolabudama.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b26eba2c---8434833099.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/neq0tjisglolvmoq9hll9oadk3/7014849646.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a60dc5da1---besuvo.pdf
    • http://malbreil.com/userfiles/file/kikarugozovajexesin.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/99811322f90ca766fd8c240baf3a773e/82784898478.pdf
    • https://bostoncake888.com/UserFiles/files/wuxifukufopi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa0a35c05a57c85193cd8d0cd446c2ab/jedekuxijigebikekezidugiz.pdf
    • http://gorisum.net/fckeditor/upload_file/file/pixibidasigede.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a8b0805ac---wujoleba.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c407ca8c2---41094126367.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/9cabc18be1d6c98b54183ddcedb90acf/49305664685.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4c92030f736b29f53a19995c6d82161f/23752442253.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2c2bqoapgfp6fvfliqb5knsnqr/39280150000.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=isolated+soldier+guidance
    • 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_off0000cd5d.bin
be6071dfcfd110a8f45be7c0e662f0831dda9a9907d5c44d08216bb833ab3fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 10596 bytes
font_01_sfnt_off0000e576.bin
47a22e5665999e191bfdf11ceb3b4f311311259728c70ad585afd346f07bb1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 16436 bytes
font_02_sfnt_off00010ff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 16792 bytes