Malicious PDF — malware analysis report

Static analysis result for SHA-256 10296ab0098d503a…

MALICIOUS

PDF

115.9 KB Created: 2021-07-19 12:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62e378f6c89e59d527af065dd6b3aa7b SHA-1: 2601e4f0f44909e133bb12a1e61f997aae1cc43f SHA-256: 10296ab0098d503a95b44462427470c6e3742c28aeeb68fd5f5c99dd7b521795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure victims into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3645c5f66d---20746102830.pdf In PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/9765183495.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/42544205351.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb334b840b6---revesinepilatuwewapuzan.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kimuxawevoxosavaxi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/8992176850.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/992014373.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d7d29387---72018894018.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/f77clehf59cfopa9kia9rv2c3p/35285726240.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d0498373---88206230139.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/45462629071.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/nuneluwabidob.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/82714836690.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad54041bfa---14451821498.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/fuseviwafukin.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/98492228321.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ff5c13437b93bc58a1e566e0d9133ef0/kowemolibekujen.pdfIn PDF document text
    • http://3sdent.com/upload/files/gosowaromixesivixiz.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021612100495249.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/fekirebidunexogifanepifob.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/99879105887.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098538c5cd2d---fesawavoxavaviwosone.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ece6071a600---velawojedadin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=berries+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000129e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129E5 21996 bytes
SHA-256: db90dc8f79e2b1c0745d8ac15e51a7fdc2648a18cef43987675b96097d7ef03c
font_00_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 3292 bytes
SHA-256: cd6364b2ed610aac77c5f93c25a5b38ac62611f638a5aa92dfc0727fbd504ccd
font_02_sfnt_off000151a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A2 10060 bytes
SHA-256: c76a3817316fda12da01d88993614245c637018f22ef6817cebed6d949368a77
font_03_sfnt_off000167e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF2 26088 bytes
SHA-256: fc255417943e520d3700c7e384ee51cce5c1ec38175b2a22a434b397d400d678

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