Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9244d1c323fe4a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 14:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0b911d42b92afb38d06e2276e1e204 SHA-1: faefed6d55f4ee40293265d2ea0f1e7a8ea454c8 SHA-256: be9244d1c323fe4af45d619f6955597c4d1c7459ff5352e93c8522b6ffe986c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac965f0c6---66658799574.pdf In PDF document text
    • http://penzion-u-zamku.cz/files/file/12549908479.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f632e2b2bdbe9afc0669fc3933e4c289/47453504677.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/62174287019.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c21b7d89---60250392173.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/99332103902.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/pebojasetajuwuxez.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/2khevgvtip7hno4mbgukpcvtsj/zovulefadalapataguvedule.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/10864019401.pdfIn PDF document text
    • http://e-hematologica.com/users//file/kijivegudewawes.pdfIn PDF document text
    • https://tdfstore.it/file/dumitixisefuzufosaparaso.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b1a8674b---fimexugazivag.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610315b060706---69867534020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611169a268b01---kagaradi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00687a23---99653503238.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/98353777561.pdfIn PDF document text
    • http://hueide.com/upload/files/42031516533.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f146ba16c6010411dcd252b2720750d5/56934019522.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/87207769763.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed32e15dd2---naloxijo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/8140353528.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43d1296fb2d331d3813e598ceaa69fad/78755507090.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zazojole.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/933d1660f055a485671240d5924ea93a/felurupawuwetosemelakojot.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5a9791444ac93f0f4be6de1a73289563/35883649870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=foods+high+in+oxalates+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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 10756 bytes
SHA-256: 0b3fa1891ac676e8ea0b2e4e7b213aa97ff0129addad9b7984245b59ccb35984
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16840 bytes
SHA-256: 9b5424aa8d25a84b838c7c53b06e8cb03f6cc56e680133797c8d94dbcceb6ad3
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1