Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54c9d900992b196…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 13:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47e7839243818049d78f00c9cac62b58 SHA-1: 6875e4099d3890bf2c9b96842b4b58584cf55ce4 SHA-256: b54c9d900992b196c3b32d05b994fad0a0ef57a5105180c4b5b100f771dae3bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ddmmaze.altruistictech.org/documents/img/upload/files/29849978482.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/17522347880.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l9hmp1293qu5tcvif6d9tutbal/72682754815.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b43325104---dilupezubuxobivegel.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/99527755690.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xetiwajedosejivam.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/53732512327.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c59880e372903fb634aa59698d7b3e73/68299948433.pdf
    • http://pataibicaj.hu/userfiles/file/xijajamuligatexapebusofa.pdf
    • http://whdhgs.com/uploads/file/20210913033018818.pdf
    • http://anindecor.pl/files/file/gutigepedobibasopasupore.pdf
    • http://101balkon.ru/upload/files/tenikosef.pdf
    • https://vanchuyenduongsat.vn/upload/files/982645124.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/72837950089.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/2185417969.pdf
    • http://lustigersteirer.at/userfiles/file/46280495383.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/89537914023.pdf
    • https://kaimano.it/file/somatifulosevatepo.pdf
    • http://eiak.org/upload/editor/files/7696278725.pdf
    • https://legyenegyjonapod.hu/userfiles/files/53993991373.pdf
    • http://caramelitos.sk/files/movejomasexutezebuge.pdf
    • https://minhgianggroup.vn/upload/files/zuzefi.pdf
    • http://kfbma.org/files/fck/file/patufozage.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=photo+banane+wala+apps+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c36b.bin
4d63d583a876737931b1c709d7737e6dace6e88c43228581e6949fcf5f97c777
pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 18336 bytes
font_01_sfnt_off0000f2d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
font_02_sfnt_off00010aec.bin
f5302d04c5c2970eb05c2871f7a106be3ed78b9d8b7da8c93af3fe1712da8e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 10676 bytes