Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fb8f79f555a3eb…

MALICIOUS

PDF

99.0 KB Created: 2021-07-30 19:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa4b45fe998eac7e1c91ff25db0ca939 SHA-1: 54d9d596901ff1e47c45d9b1b74b48c3a3544094 SHA-256: a9fb8f79f555a3eb01cc3611c818f76e051a191e3c24279fe4d1ad8f6e2260e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable or compromised hosting further supports this, as these are common tactics for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/uplcv?utm_term=detroit+diesel+inline+71+series+service+manual+pdf PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d5fdc4869152ca8cb1c1e3e6e558a894/xajawubevawunaj.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625502119.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c4ed8ee5---motojagede.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cad24c8e9008d7311b83e0ae5d3b2b75/gevobeg.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vanikarubaxa.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/31025223091.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be89cdbfb3d---53166473455.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/22d82fa30caa34ffb398eee804793499/lakikowowedirijer.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/46479542096.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c6773f12---18485242214.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/47712949733.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36b77c003---30727186919.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/adb71c4eef1907a239a96cbd23f66083/sijafofego.pdfIn PDF document text
    • http://aweibel.com/Photo/file/48782283383.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1bfddb5b4---93941853370.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e844b83ea---dokubek.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/tonurupebit.pdfIn PDF document text
    • http://coffee33.ru/archive/file/nofewotuwibozatazon.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607224600055c---gagisawuziseramuxowarosi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cc7f4892109f2489cadbed6c5f0203cc/bifiw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb8db2494---dulinusajudijawuridapadup.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_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 11048 bytes
SHA-256: 8c99fb8e7ea8907fb9b7a0a45f32d80d3c556f31392c3932406058b854ef1ed4
font_01_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 17248 bytes
SHA-256: 12fca78fe208c0c6e23327d283d0ad1d36ddf29356ee0b103f3953261791c178

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