Malicious PDF — malware analysis report

Static analysis result for SHA-256 72503965fdab7feb…

MALICIOUS

PDF

80.8 KB Created: 2021-10-04 13:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a78078dac3bef7f7e2643f4eb477d7ae SHA-1: bf4d430ad88d428d41c6a1316037ce57fd1a64fc SHA-256: 72503965fdab7feb2f8f83fbc3370d1d1fc356b026cf8cce8a4bf44c87bb9aeb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615432117030f---74237765032.pdf In PDF document text
    • http://belniig.by/public/file/vejovunopuguwigu.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/delesakupodorafasazatibi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/93132085938.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/lafutuwutera.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/mugokadedixufexefejin.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142263f33335---34554618788.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/53121270251.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/55752049994.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090210103047.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/jozivulejomomuwamojakenis.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a44d154d8---gopotol.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/80628574207.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/48790690891.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/20669377230.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c31a6aa16f---jigulo.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/42072927623.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/91674860003.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/48013660390.pdfIn PDF document text
    • http://splogservice.ru/content/file/53864501533.pdfIn PDF document text
    • https://cicimanis.com/contents/files/negularinemiz.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///mukon.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210923_6F0F5D970589E1F4.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/6656342749.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/73227089720.pdfIn PDF document text
    • http://ridendo.cz/files/file/36094318292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=history+of+trade+unionsPDF 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 18108 bytes
SHA-256: 6d78d031c3c038a0962d6e81134c8ccb328bea9a4b9bf5843568e83eda43588c
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10504 bytes
SHA-256: 9e64be14b9eeb749c3aef819cc52c6fd25b897680ff7148ee1503f3c8fbdf9bd
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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