Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7164d4ba337ba…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 11:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae931551b743be70c025c93dd5b47037 SHA-1: 745f0339153aa40f845d2bbfe771e1eec5d49caa SHA-256: 42c7164d4ba337bada39a8a16c45690cbb60316af1aad04ad0ce2ca07f27943f
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 document functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress upload storage or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://inistor.com/ufiles/files/supipevibejaxikire.pdf In PDF document text
    • https://birutelorasin.com/contents/files/muwukukopuxafila.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7b4c58f6---65251826578.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/zutetelunuzalazesof.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/luvedisotabetokubiv.pdfIn PDF document text
    • http://rjt1.org/upload/files/6149220270.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/83272986361.pdfIn PDF document text
    • http://yejida.com/userfiles/file/jolibovepuzimakedesavisi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160780f91a1a7e---52011423204.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021073003023632.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/texidizedosub.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/watipugizurag.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/xuxigokas.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/61079338418.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/12595074528.pdfIn PDF document text
    • http://runo34.ru/attachments/file/nebixumepifewukewama.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/809d5a2ba69ba7dad99ba5271cf9b290/sosarugolelirugisudoxone.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/74137765230.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d507a5719d---82056138499.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/42944453011.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cf3980388---90025980185.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c7d1ce535459f8f489d742a5aa37a6c/33723136086.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t97ljletk839hv504vlnj7fue5/19966623332.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/60195847176.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/74fffdcc8670ac4bb717967a504fa42a/53772433392.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16270461612133491448.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/wamilemepotej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=endued+with+power+pdfPDF 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_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 22444 bytes
SHA-256: 471891349c9914b59e1e18aec86a716bf066659cffdb09397deb5f58a7fc01f1
font_01_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F8 10388 bytes
SHA-256: c51468887d0cb6faae54df15f795131a0c6dc8de7f77e9e369f3e0bc3a4dc8db

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