Malicious PDF — malware analysis report

Static analysis result for SHA-256 616cf91f289c3da4…

MALICIOUS

PDF

93.0 KB Created: 2021-09-06 00:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a424089b7688348f488c97fb0d9b7996 SHA-1: 7adbe32e0fda73769e282fb2f7544ec0db571710 SHA-256: 616cf91f289c3da424030fdbe3c576e36c4db9ebf5da108d31400a65025c1b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs further supports the attack pattern of directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mimpishio2.net/contents//files/disujowabonifedizebagurim.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d21c17ab078---wekalopituruzagidizegibak.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/gifab.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/aac172c5bdd6a7b9540f1a1855e1c5d6/jazusanawetomi.pdfIn PDF document text
    • http://sun-eko.eu/files/file/57232885387.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3f4801ee117d24345d3d0840daf792ef/15959515343.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/wixinaxupulugepigax.pdfIn PDF document text
    • https://datajournonepal.org/files/sutemarefegoriwe.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9daf04c1---litejunidopiwiraruwu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/77992443955.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610af9a60870b---88442804233.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105150945.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997b292cf3---navekabewop.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/fezikigad.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/4639868799.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1e05ae16---fizewogesexasox.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/rugokiragawizonon.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3dfa4fb6d573e87a0cc8a14d69befc61/34446869043.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/11664183272.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tejibezosovuwozonuxopoju.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/70715666300.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fivotazorefexadorigomo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210703173417.pdfIn PDF document text
    • http://heizler.hu/files/file/riwenulajejewasigag.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6ea421ca---zonaxopogilanojar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=personality+and+self+concept+in+consumer+behaviour+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_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 11308 bytes
SHA-256: 61b3d278a42defb442aec2a2e35da64d9630aaee8a1dfb438377af9298b1a535
font_01_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 17664 bytes
SHA-256: 0611a78c8453608c642049070dbe981032ef99b0a1b68a37db30f244f3faebc1
font_02_sfnt_off00014d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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