Malicious PDF — malware analysis report

Static analysis result for SHA-256 db95a15ff18a0117…

MALICIOUS

PDF

82.2 KB Created: 2021-07-13 00:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: affcded5c967f33a5dd2d46ad80a72a9 SHA-1: c5fb5e33b985607a336758225428e5385a04b972 SHA-256: db95a15ff18a01178d2c79e3ca226c27e2134ab03627ee1779145f70ba22d09f
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lure victims to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=milling+insert+specification+pdf PDF link annotation
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigafirefudagep.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wotusakewuxumoginajajalet.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/kuxaxekozimiwiwimagotere.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/45772065819.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ne9ohqe9pkkcqpb99qpsb6v8l3/49997109039.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/10757057968.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/balugiti.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ca5f8033a9aa52bf908694b03d4e9ed6/36883557846.pdfIn PDF document text
    • http://www.puhito.hu/uploads/87437565885.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160747fa385b1d---67506697065.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6665f5d042df9037a624e0ebd05fc04b/32234192235.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/1145783357.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/95796030899.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/51747095494.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6c7a067f---56300469596.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564a00918a---20185684389.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904c0bce403---bibebemozakukatirexer.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gogewuzarumafe.pdfIn PDF document text
    • https://noddy.nu/images/file/xesibesane.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70fc1613c---xelugunakutexofo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/32012db088abfb69277f3706149c7f7e/70635022747.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/fowosejomeriwenufekologum.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/62189273554.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b40c9b402e29ccb79728b7a3c3f13757/tedefawim.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607044fc45bc6---78187914960.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 17164 bytes
SHA-256: a748cd48e358fded2575a5505642e9a13a6fa16e23a49747d15cc57cef0d2c0c
font_02_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 1700 bytes
SHA-256: b6744b52a823c6e0caec6b019a394156cca920341963d9a1e29782b3509c409c
font_03_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 10788 bytes
SHA-256: 1c57c5637d94855545c12423385d14d96d9d753262191edb24d3203bc67a04f5

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