Malicious PDF — malware analysis report

Static analysis result for SHA-256 358d8e69b1152254…

MALICIOUS

PDF

147.4 KB Created: 2021-06-26 01:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d0bf3d376ab1046bf2688bbb1482acb SHA-1: 3a25a206774a0ecd88a8f0029485cfd5fc675eea SHA-256: 358d8e69b11522548c760b91e1f9abb30221fbaa9a63ebd74614a925c0a475e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further malicious PDFs. The URLs point to content hosted on various domains, suggesting a distributed infrastructure for delivering malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ae4987eaac8523afca1d5f388fd6e023/87719994986.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5mqu62c9jdse23d84lud0pbomr/komimuwemen.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be825576cd3---barijifilumesatefikusogix.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083537dae332---setolajipifumakapekenigaf.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u15heplqosb575u4u02apti7er/nafinexami.pdf
    • https://ahreco.com/uploads/news_file/59289162773.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/41398284737.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8f946875---bufepuravodojina.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf58cec14---jideravekas.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b774a8a9eb8e473571c3dba85b264cf8/94539018829.pdf
    • http://ilovemynewstemcells.com/clients/865932/File/vajisi.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/60088192258.pdf
    • http://global-insurance-broker.de/downloads/guwikunakeluriluzobibopi.pdf
    • http://rajskiewakacje.pl/userfiles/file/mofuxanizefo.pdf
    • https://telewebmarketing.com/FCKeditor/file/kulupawababu.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/0f06b6e391f9ef868a5e18fcc1ea272f/visulajowasub.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27a6dd24e99a38d9e3664a92584200f6/mefigelurakidebarewo.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/27932143d82e57efd13a59e8f472b919/vaxububudewazasa.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6bb5377f---58782659833.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/fuliwetodilidufawuwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chemo+and+radiotherapy
    • 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_off0001df44.bin
4504ede4f360567a77091fc2be4a65495a102ba20d26fd708ca0190d3b974169
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF44 19220 bytes
font_01_sfnt_off0002104c.bin
a6c6318da4f6509844f116e5de3321377bececdddbb2a4c52dcbfbe756c6f3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x2104C 10588 bytes
font_02_sfnt_off0002284b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2284B 16792 bytes