Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae82197f63b8438…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 14:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d5491fd9c3e7845cf5cb3f0c3124944 SHA-1: 9227d46646ea918e376d81fd95b26a6ac5a34f0b SHA-256: 8ae82197f63b84383a04aceb74156c304e2bcc31ba0b01b038e82208db6a5039
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm characteristics strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=general+knowledge+pdf+file+free+download PDF link annotation
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/250359bdaf5f8fc60591a93ef8d52416/88664902828.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608337bfdb1e2---kowoxebetavogas.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/htoql8dri612ttdidrmhk3fgp9/toleledafabeka.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/kokezovugugaxun.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/q38lpi7slvsv0oudodorjae836/97627168387.pdfIn PDF document text
    • http://hybsch.it/upload/file/jakofusujidun.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/puxoragajarajokora.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd34c82177---77119974864.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ef6cd7d---17187629905.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafb46c145---nosodigelugukur.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6c2b4cbc1---29307907374.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/vevuwibaz.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/31083497475.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/97080823719.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/dujomemakadur.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/bojinujuximipoxinex.pdfIn PDF document text
    • http://wenxuezj.com/images/File/riwogakanug.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/813srrde40ndafl3jr514vqicl/7433759348.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/66593298905.pdfIn PDF document text
    • https://rintrans.com/files/pisaparumidetabuvabob.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7669c0d0f---todigure.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/dameroropebupasukabarapu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/mobudifi.pdfIn PDF document text
    • 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 17216 bytes
SHA-256: db4ee5923d64567ae491c89e179b309868037729bdce9d968e80f390ffed1d90
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 10624 bytes
SHA-256: d357c1a0bf544541141c05131edcdaf8deca1f638fa366413034e8f21ac8df1b

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