Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9e2ae051baa897…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 21:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebd4d6ff6b88e1047e442eb5a7c3b4a8 SHA-1: 9f4cea89a7dbaf93ab1d02f6cfb6bf2ad32a49a2 SHA-256: ac9e2ae051baa8972391c4baefa988a884cf6cb94f34fd56b05bafc761a8936f
156 Risk Score

Malware Insights

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

The 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 pointing to numerous PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The presence of external URIs and a link farm structure suggests the document's primary purpose is to redirect users to other malicious or deceptive content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://na-bytecek.cz/UserFiles/File/wexupigiluburelota.pdf In PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/titesazu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903014436943186.pdfIn PDF document text
    • http://serting.eu/userfiles/files/kuwamurawafowijesafogo.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/77698945482.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/58246093717.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f313d1e6d9---dafej.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fea19b964158175f27b9d91a7903bf83/88200736063.pdfIn PDF document text
    • http://fpole.ru/sadm_files/welizifopefodo.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/14676221262.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/puwuvumijuroburu.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/tozoxofuvapa.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gufimurezimarokazam.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C78B099E11BB96FB.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ad8cee4812fbcb9f68979c404cda9ebf/26312806291.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kesezilolapunuli.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc1b61f17---minawudated.pdfIn PDF document text
    • http://coolscape.info/images/files/30667396338.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a80b2ed49---rapewuv.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/pokamigefika.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/92878127235.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/jumafegitewipulevudifumer.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/finojapepol.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161341ca9b2e4c---lomevawutamifuwituj.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/92606337283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+camp+of+the+saints+for+salePDF 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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 18152 bytes
SHA-256: b833775d5fe7b296492e190a1b4aa819aaa53cc4573c7cc2f228a6cb6f14b46e
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10708 bytes
SHA-256: 0caf1269a1cdbcac191b9db7972832aa474681059029f453f0f80eccd7b7dc9c
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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