Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9699ef72f27302…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 15:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bc82c73345a26792b919d7443a6dd6a SHA-1: 5c87ee3b167ed6c45a02bd3e169e71ce07d193c6 SHA-256: bd9699ef72f27302e01c6e692c886429891ba4429c4dce5c51701cb779f08dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various domains, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external content.

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://www.alfapilates.pl/upload/file/63469600508.pdf In PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/fatisibixuwujex.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/lixazejabimafexido.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/77303271807.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/mazaramoneronanixizizi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9f63549405e2d58f9aaf92b94f05b1a5/zogugedasaf.pdfIn PDF document text
    • https://cristalensi.com/public/File/puduxiguzadi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070547bc278b---wafafeba.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/11253055631.pdfIn PDF document text
    • http://ccsl.asia/files/xopovuvufotoxakirulisivi.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/97703312913.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/doxalodowem.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/2230197923.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/31356391569.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b747127a1f8---lavotejolepotelidaxifobiw.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/midupofepibelar.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/5631467080.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b233f9b1de1---bewunomolanivaz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64523204690.pdfIn PDF document text
    • https://telenovella-bg.com/files/31560917393.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/51930418767.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/47616238798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jitterbug+cell+phone+owner%27s+manualPDF 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_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11172 bytes
SHA-256: df215dcafcdcb6a616deae7996a6f775c60fd24db96da897505334c49ab6dcbb
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 18104 bytes
SHA-256: 9b31f70faac58eab7afe5992bcc322b6424878a6097c3580f1198df91e163740