Malicious PDF — malware analysis report

Static analysis result for SHA-256 a513a65501748f2a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 11:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bf768f39843dd909d33c372e0a24d26 SHA-1: 2e3e4d539e4927ba1f15084a6a8806ca217a181a SHA-256: a513a65501748f2ad1790986db9bee459fe1580705662140d57237f5aa5f342c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on compromised WordPress sites, directing users to various PDF files. The presence of multiple external URIs and the nature of the link farm suggest an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d48372157---juzujaxarux.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609be69251bc3---1677865296.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3713730a---pijabapewuxubefusave.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd510301e66---wiruzaroravik.pdf
    • https://angkoronetour.com/userfiles/file/fugajowutamuwolox.pdf
    • https://shindah.com/images/ckeditor_img/files/defewelovufoxa.pdf
    • http://redskap.ru/userfiles/file/14451827178.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/76372632184.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/93779356970.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac8194ba1---42090902766.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d367ee14fe---nazezu.pdf
    • https://foodthings.us/userfiles/file/zatapisozujebubuso.pdf
    • http://cmtsport.com/pliki/69364256623.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5b9e719241fd905e5b60ea0b68443e39/35314636100.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/p8sb4r6vfibisodr5s0uj2o2en/76785290231.pdf
    • http://esistore.de/userfiles/file/20412243955.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6446c331c354d11ac116ef5e5dc000d8/taponowajurexosonigimoru.pdf
    • http://sanchariglobal.com/userfiles/file/rukijadut.pdf
    • https://aawyx.com/sites/default/imageuser/file/waratijeribarejodigedug.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/gomuwogenakunojom.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a23e09a0---vanuwogabunazakizikazajam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=organizational+design+principles+pdf
    • 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_off0000e2f0.bin
9f7c64edd9eb57fede7b676b31e2946ca62d717a907f79287582a7a5c0c0b3e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 10880 bytes
font_01_sfnt_off0000fc10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
font_02_sfnt_off00011422.bin
26feee7e959c7dee6c4e4754c950666f355fa35f17dac4907b326ca2f69fe5f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16804 bytes