Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd164264d19f15a0…

MALICIOUS

PDF

99.8 KB Created: 2021-09-05 16:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24936b9524b11aa257b6255d7967e54b SHA-1: 66cc640635214da3b93a8d52d7b64be211af343f SHA-256: dd164264d19f15a08d933020d09eedd2ad509a84342362e535c2032e22572d99
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160890047ed6be---daduzebevaporojifaloxu.pdf
    • http://bscartridge.com/pic/80261705539.pdf
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/86235527030.pdf
    • http://kubabus.cz/novy-web/upload/file/wumate.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/manebufepowow.pdf
    • http://creaorganization.com/depo/sayfaresim/file/gukefazebudolobax.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df08cab874---balexixikowefap.pdf
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c465cd8870---80818114881.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe5e025d4---nejorozukovekemugedod.pdf
    • http://short-story.ru/upload/file/gatebija.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7a627b886fa1c1f31b0b5945df7c5e22/26623714169.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467891e123---mokujuriruzutikurezovu.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/l0em5abconqk1vl872qccovkuk/97434702121.pdf
    • http://kirilmazbardak.com/userfiles/file/toguzif.pdf
    • http://chip-chup.hu/upload/file/84147379550.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9afe36390---xupinukogusezux.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b3be90f22feb1b22308d59dad5258ffd/49438493509.pdf
    • http://jtylek.pl/Upload/file/65224661918.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96236063692.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12422773577.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950b8c1a40---karera.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e2082e70---69405117887.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075797cb15d7---pogiledotowipuxawiloz.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/82400591515.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=amway+espring+water+purifier+manual
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9d.bin
a86fe1abd0c4f109662a133f920fce49d122c4a781d13dfc993843be55db795c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 10864 bytes
font_01_sfnt_off000106cc.bin
c93651ca8a622be54dfa705f2ec918c2baa60aaf2f61310f9f797c437deb6d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 26804 bytes
font_02_sfnt_off0001480b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 16792 bytes
font_03_sfnt_off0001601c.bin
d4a995112389bd103ffed501c710b7a0f1018d17363eae7e6bbb77ab237b20be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1601C 16632 bytes
font_04_sfnt_off000177a8.bin
9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x177A8 1868 bytes