Malicious PDF — malware analysis report

Static analysis result for SHA-256 812d93edc9e408e7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 02:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74120a06b1ede1b71d02c2aed6598907 SHA-1: 55e720af4ffb2b025a55c00860c646241aa6794c SHA-256: 812d93edc9e408e79e9bc9d862090c890b4eb14a2242eb9bf3fd3aa6b4678012
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=casio+watches+f+91w+manual+pdf PDF link annotation
    • https://lensprovn.com/ckfinder/userfiles/files/kedipojevujaleditiwekidu.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/74564870878.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fea00ec2e92---tevozo.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/70395663359.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9229b0cc7---fetelu.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/60967062809.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/13488581726.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75045389987.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219f53b2cb1---74884574169.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/dizusobisubinapuzevexi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/72688007806.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1aa0cc4365dbabb6d6e4c1829317478a/51600495116.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952126843fb---61719214508.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/39952683778.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/ruriseso.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/toxevarenewu.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/bogevimefekabip.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611357bd103f2---lunisi.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/wekorex.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061416273965.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9ad90a5e---83955945014.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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 11220 bytes
SHA-256: b3aedcb3943a2c51dd8cc9477c340b8009262611a2352ccf25a8894e0fcbb48b
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17088 bytes
SHA-256: 87bbb3937c9994553d708c6a6b64c9be6610e54b8dd5716c2de84e6834ed33f5

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