Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9a16ea3a6ddc21…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 13:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ab02f4422fd24e9f23bf14b42d94db0 SHA-1: 170d7051138e12ba1f3f57c95d2e2e33aa45a4f9 SHA-256: 6d9a16ea3a6ddc2132fac08b613a2e6d6805aa85c2682d411dd8b3e0a002c386
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to external content. The presence of external URIs and link farm heuristics strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://normel.org/files/upload/file/70712832120.pdf In PDF document text
    • https://stijsr.com/userfiles/file/merugigipawapinav.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/fokiraleputax.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/73807096880.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/zejuturil.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///59517124838.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ck68qmnudevra51hkj7f7l6681/58022361612.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a60a425a8---norozis.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/83dfe5ade61a13a7f91f9834fe5acd29/luwifagebaradegum.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160dddd1a7e660---44754966012.pdfIn PDF document text
    • http://smirna.pl/files/file/sikolidatizavisuxabunuxin.pdfIn PDF document text
    • http://cichanski.com/Upload/file/93535795168.pdfIn PDF document text
    • http://horgaszvelem.hu/ckfinder/userfiles/files/35537483325.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e81d6a6e---xesiju.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59141610417.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210611214327_0rsboz.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/86517379138.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/38383821645.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/xinaxafaxijun.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/6080344717.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/totonowi.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/zetozakijepojib.pdfIn PDF document text
    • http://perksys.com/userfiles/file/bebovawagesodegometan.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vimuwivadepuwejawaxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=horaire+sncf+rouen+paris+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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 21400 bytes
SHA-256: de5768a52246a5dd0d79f5ccbc682e15f3e6115c542b06dce9333a2fde121c4c
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 10560 bytes
SHA-256: f3808fd83450092e6fe6428f93f5c9e7df2530784e1d6188d7300383b4238ad2

Open this report in the interactive analyzer, or submit your own file for analysis.