Malicious PDF — malware analysis report

Static analysis result for SHA-256 842ec1835eff1e53…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 06:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf1786f2ac068024f7513f52329f28db SHA-1: d9c13c337f9cd753f8af8b6b7f44d24f9c81868f SHA-256: 842ec1835eff1e53453ff40fc16cefdb6d8f1cf240777770cfdc7b52e7035f31
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//21405055334.pdf In PDF document text
    • http://pomocnaukowa.net/Upload/file/vulebevedexawazufujuj.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tozaliwatorilukij.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/51677603924.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/79789269662.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/lixalorekomar.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b508f5c27a---65359950483.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fcce97cb---kemufitifepudurofaxi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2e82e3fb771ed88d141fb474028d99b5/35168780908.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/g4mmv2fbfekjbh91g2dg1seb1q/17178555953.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c390f749---bapejuw.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jisovojajetuxapezorobovo.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/20067612907.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09f009788---81392549931.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdf95ad649---wakaxerogefusulup.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/50985981888.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rts0450678v91mvue84lk1tdej/73636893653.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16204960583006.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b71255a8fc8---16526402801.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nedorufamux.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/77012665117.pdfIn PDF document text
    • https://fotovipvercelli.it/file/bevixakuba.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/70a7d01073719de8ae4358aeefffd9c5/81138724945.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fa56af84260096c72b14394364d80fa5/57314968733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=flower+pot+drawing+design+imagesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 16456 bytes
SHA-256: ff9b4af5c282e3744d3c6792353663ddd5daf90cc74247de361ef6791e5421eb
font_01_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 10796 bytes
SHA-256: 066657f64fc871632a046a6b1374fd263648561a25e22f811fb0c5af622fcecb
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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