Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c142d1ccdc7a764…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 03:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 792e207cfcbd2c8983f7084b4a93e407 SHA-1: 22f37f44e06ccbd41bb7763ecdfde02a1ca63101 SHA-256: 2c142d1ccdc7a7644e0bb9a74f0a2867196f3b223035642cefaeec26abd940eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=self+introduction+pdf+for+interview PDF link annotation
    • http://locum-system.pl/userfiles/file/fukezokawobadukaz.pdfIn PDF document text
    • https://rajakedua.com/contents/files/69025195928.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/duwokowonelesufiperebaso.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7cf90aa9---fupaxigapemejivakusifanaj.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/25d4189c1146bdab7797ef4814956e2e/peberetorir.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/cvfe671j31kvqmr3ntdfrb4ffi/namijawuv.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h5g14v4uneuptvovt9agkrnjq2/79298816695.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0m70g9gml3barrv7q09veh24qe/50485797277.pdfIn PDF document text
    • http://pronobile.de/catalog/file/vufuriwunibure.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/12016184442.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/501417a1c5c7f98190bdbe27da71d107/jaxafakonogexapeneviragaz.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/velevuw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/h0ijja411fq8i6bv08nstkifba/48102317127.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wijuwofag.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607683842e06c---kijinuwafoviwoloragume.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/55823857797.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/wazebetimomox.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/20097759958.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ebc3f7ff83f12774eeda070977e9130e/71108181197.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xikupoto.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/76769940982.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085c20b1d47---lejaworoka.pdfIn PDF document text
    • 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 19020 bytes
SHA-256: 78e64ab3a6e93aca65a28b55c378a097d53465f2caf9fa92611caf5b3cfa8e7c
font_01_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 10608 bytes
SHA-256: 5ea9d6c953a06f4240c184d19ef66a448396515a03a94c5036d84c7562ada1ae
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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