Malicious PDF — malware analysis report

Static analysis result for SHA-256 9513895d3662663c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 05:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8b5d15ca33c0e0c4268f1c1b4d91380 SHA-1: 443a205f0c687dad6b0ea1e703fd27176fe4b540 SHA-256: 9513895d3662663c08422c38cbf599993f92b8fa38e85a0abb2a9a10250a7f36
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical alert for requesting recovery secrets or private keys. It also contains numerous links to potentially compromised or disposable hosting sites, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to deceive the user into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://htwy.com/upload/file/bizedebujisakowomokefeke.pdf In PDF document text
    • http://mikomisushi.com/uploads/files/61026673215.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/sazekodobazosabi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u8p740cd9q7c49e01uam90m98b/fafovek.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/fiwokado.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26f2290c6---73541324258.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/47f7dcd1dacd26f7d57c0d10798184c7/dogare.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e25a704f16ddbf86a1edb391a3922c00/gorutugimo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/82538201464.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6hib1jgdgcv0ft21sejgmcmnqn/sezivebeni.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090450f06213---55011765808.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfd3429d4---pinetum.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/84541558410.pdfIn PDF document text
    • http://tdbm.vn/upload/files/72806095235.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/suwenafaradajero.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/59774208550.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/bomewitijorovevuguxig.pdfIn PDF document text
    • https://wittnebel.dk/file/kuwurixilawuwi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/el744ocal795nruiqk9mnakto2/5341554717.pdfIn PDF document text
    • https://onecre.com/images/content/files/66497120089.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/dorotena.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/e65596e8aa6a028e67fdcd1118f478c9/9879201213.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c94106a16b---93771513724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=foxit+download+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://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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10256 bytes
SHA-256: dce410c5dc28ac6b751ce5de2db96679efe90db4a30b8e538346dac57ee027f5
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 17312 bytes
SHA-256: 865445e527fe1be2d31b26940a838f3811de710f46944b65ff744dcb275bcd32
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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