Malicious PDF — malware analysis report

Static analysis result for SHA-256 d073653aee8585a0…

MALICIOUS

PDF

65.3 KB Created: 2021-06-24 12:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ace1e68c04d6cba3d44592be83fa3355 SHA-1: 1ede88027dfa823b362d43bf985b9e1ed903b146 SHA-256: d073653aee8585a05bf532e152b2862b81e459cb8e056f0f45d98fe75530af2a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of 'cmdjtsj5rf4up2g40/53001966308.pdf' within a URL and the 'LOLBin_RUN_COMMAND' heuristic indicate potential execution of commands or exploitation of vulnerabilities. The document's content, disguised as a birthday card, is a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad50b774---29301772040.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c921f28fa6a---33544543735.pdfIn PDF document text
    • https://emmaushuis.org/pages/57377792740.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd041e19537---gasolir.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918ed58675d---semagotilojageduzaxar.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bkavn919lcmdjtsj5rf4up2g40/53001966308.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d51a72394---79047745182.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9b999529---13656515998.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd1d173d4---21669708531.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160739119b6a5f---60745435529.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/xowevunagasizofu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/tufanumatemuwod.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6e524a82d923f6414f8af24071bc7f93/46419659840.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0add5325---sefedagorifetisabawom.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/loxifosogumado.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c13f6742670e5cdebb057996f571332/fosugu.pdfIn PDF document text
    • http://abapaposentados.comIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=happy+birthday+card+printable+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC370 5268 bytes
SHA-256: c1b451b940633a61fde3d4ac205b6de8c49a0f2a13d786c02227d770c4b95be6
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 9768 bytes
SHA-256: ccc3f06eb6c32b66d993bfcb25b972922b63e15537a46d0746eab416ef508b3c

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