Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9d2bd2c444c966…

MALICIOUS

PDF

94.4 KB Created: 2021-09-04 10:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3edb06356c4c38f7ae9d62312813748f SHA-1: cb69299311051973a36602117fcfd5ad0eba7e47 SHA-256: 7f9d2bd2c444c966fea3664aa41642f804dc6ab2d0cbe34aca1a4700c7a99b5d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are associated with compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://easytravel63.ru/ckfinder/userfiles/files/17287185967.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd126d75c7---4667713895.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/be782d6921d9135d3325c8e723f3f2d8/46081191988.pdf
    • http://zae.me/datafiles/file/mogafugowapifanasarutexap.pdf
    • http://foto-preiss.at/upload_files/files/22620240947.pdf
    • http://xhiehchin.com/Xhieh_News/_file/51579307729.pdf
    • http://anpo.vn/upload/files/loribedepidiwided.pdf
    • http://bigsvatcharasith.com/userfiles/file/35606932931.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/68303655110.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6c62747797cd2dfc77005010b1a518d7/18971335101.pdf
    • http://telegid.tv/userfiles/files/18790548806.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12205d6374---fobobebotewibuv.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbfc39ac16348246572de50a637de51d/sijiwunexeturuwute.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0ca68852---58456665436.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nuwoloveka.pdf
    • http://alkanboya.com/files/file///tamikabaponidavovariguna.pdf
    • https://travelstore.tn/userfiles/file/bevagiwinanabugoxatox.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/lutotajefexomafolesupu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/589582cb6f7f0aa957202857908c67f7/kunogovapisopufu.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/lotojovewuketuximuk.pdf
    • http://okna-dvere-online.cz/media/upload/upload/file/daworuki.pdf
    • https://abofahed.com/userfiles/file/kolitugedaze.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/66545335074.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6824c97de4---62423665914.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=libros+literatura+fantastica+pdf+gratis
    • 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_off000106f1.bin
dec539ee02937372ef88e2623b6718608057e4861817f96f710ab543507e6358
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 20180 bytes
font_01_sfnt_off00013a41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 16792 bytes
font_02_sfnt_off00015258.bin
24e9575a06e417197b07932f23df794a8c1f992babc34514703e4d308e96fba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15258 10992 bytes