Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba170cd0dae484e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 07:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a57f45f01130a24fc746775a64ce324f SHA-1: ca498eff1bd087482c549a4f063a71aad5815c05 SHA-256: fba170cd0dae484e68e7a591bbafc64a3812a7098f6ab901e92f6a172b5c1d5d
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. The PDF contains numerous external URIs and is identified as a link farm, suggesting it is used to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=final+fantasy+3+ppsspp PDF link annotation
    • https://rabudiagnostic.com/userfiles/files/pekepelaxosobidapi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27593385289.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/74616309110.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/55178196552.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7578c10c4824e6b106ca17fba346ef0d/16338684434.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nakopevana.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/93396133285.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e769ea89c---88721812965.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/bivozipikenir.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfdd57e38---95690635739.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60531e689eee910a247c2befa1131d83/jolavigixukuviwurosete.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210904081410.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/93495479657.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/7307457594.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/zukejogeb.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/radog.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/82529037011.pdfIn PDF document text
    • http://tochalco.com/uploads/files/53879683837.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86883703376.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/xukipofukumepozagutuvano.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/24940425975.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/93731574162.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/20884279944.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fodep.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 15924 bytes
SHA-256: 380f6e52077d38d8902a6fb1d160829e84fae2a2274ada581e31daeed2b578fa
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 10260 bytes
SHA-256: 56b3c9f628d3d7e9985c118cf5f075e1cb2c66a094d0aeb269f793d7924c285e

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