Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2a3593b41dc494…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 11:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64f80399210d38e85ec50cbdc1485147 SHA-1: 5ccb2c046c5ebe65de219be58baafcd02a6acc8e SHA-256: 7e2a3593b41dc4941ee9179839d8fed39e02ac1cd0b65e2232372e98563124ec
184 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being part of a link farm, with URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports this, indicating the document's purpose is to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d52c800219d4b22ac79848b2ee56486e/79499697776.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8fc9b0a9---jakanoti.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/koledefewagofovozalazu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/30199253354.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161000718d26ac---23752228465.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/15657016250.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://searchlink.org/userfiles//file/dibuvodiwozijexewuli.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/zorixikenalawizajazososij.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/xisigegarevoposupogirala.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lugakozalago.pdfIn PDF document text
    • http://hongdacable.com/d/files/85501195804.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/45921397844.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/68654309636.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/numoximitiw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/28272677790.pdfIn PDF document text
    • https://sanagustin.cl/files/88791674495.pdfIn PDF document text
    • http://202.29.4.105/satit/_Adminis/ckfinder/userfiles/files/55550230456.pdfPDF link annotation
    • https://bistakalikotenetwork.com/userfiles/file/20386664636.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/welibadipirekugixebaneju.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89782b1d8---39110256994.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/740eaa05801c61c6558629a96c00f221/vukuve.pdfIn PDF document text
    • https://rajaunited.com/contents//files/vinugidagijijuwofef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=irregular+verb+past+tense+worksheetsPDF 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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 16236 bytes
SHA-256: c1bef84718667634ff9eeb084c23b5e243559c8d0cbc3d002cccf4ad00c684cd
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10872 bytes
SHA-256: 4ea0b244a431c121719ab61b598e911ca663eff4686f0e6f87b69b8fb5ef605b
font_02_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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