Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebab9adcaf4eda22…

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 05:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae6c8416748a26165383d6a4cd54084d SHA-1: 2055dd472668b2a3361c05e192e6814901475dfc SHA-256: ebab9adcaf4eda22b36421a46b57ff95e85f8957a8c559c124dab6460ce2855b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lojunewozutibufe.pdf In PDF document text
    • https://kaptenhoki.info/contents/files/74354155441.pdfIn PDF document text
    • https://mfdesign.hu/files/file/15369073196.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613123859ab8a---88474702507.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/depikoxoxewavefo.pdfIn PDF document text
    • http://c-six.it/userfiles/files/nidotij.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/50449887413.pdfIn PDF document text
    • http://htwy.com/upload/file/10375707986.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vodofabobinamozov.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/jomegegivatuxurisofufajo.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/robagigonajiguviwuwuso.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/toneburejefamuw.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/soxobexebol.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/93513670146.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e447cad09984a59222e4f51ef6712b7b/92328010564.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/94912779872.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buzigo.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/83717910708.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2fa3fea7---79977376034.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/viwoxunazododusaxobupefot.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xojupowafifoxebadolor.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-5/20210905204512254208.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3ea3dd1cc427d88d6c7ee3de458b187b/wemasesotelan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=world+of+tanks+blitz+hack+mod+apk+downloadPDF 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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 18504 bytes
SHA-256: eb4a6899f7d670b9ec8587699bf9b222dac9b54878156c4242ea70f3340cdacd
font_01_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 11124 bytes
SHA-256: a6ee582c1c9c45c1b8596df0f42cc493017fdcabfad74e2dc07bdc01341855a0
font_02_sfnt_off0001399f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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