Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41452582c75c035…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 18:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea23bf06dac469743951107b2c8a7606 SHA-1: 10a2b312179ed9c9a65ceca5698dd39cd407c73c SHA-256: d41452582c75c035be699e3f59938a57bc2f92bac000a9ee973dbfede884adde
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites hosting further malicious PDFs. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a vehicle for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4419297e---vowupafivebipomizej.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7ffc18a00ac16bc99b37ed12ee5171f9/50698955924.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/generisitusupedo.pdfIn PDF document text
    • http://rafaelokazakov.com/file/depikozefakexizolox.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd337a7b9---96764642979.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/bf071f9f07082f84ae1743e482aba120/82184605086.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/10703574067.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cs51opfghefup3cn0j70noatvf/bopanibakisunivu.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/35721348403.pdfIn PDF document text
    • http://epicridesnepal.com/files/xolafipuz.pdfIn PDF document text
    • https://luminex.pl/upload/file/11983750389.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/pixanasadotep.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jazopoketegekap.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6f251229ba393eaa70f0b28b8aba8ef9/pevuvosebot.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/672838e121d526f492a394c039ccf57b/70267670369.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/15972005016127042d29eba.pdfIn PDF document text
    • http://soupworld.de/upload/file/gijesajaxeruzige.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/518b8b30902d27847e83cc3b7d513d3b/zofevotemigunuxo.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69985266836.pdfIn PDF document text
    • http://scarpatti.com/files/8628059058.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebefb7ab4---18016367703.pdfIn PDF document text
    • https://hsse.cl/files/38183420532.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kinegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nobody+does+it+better+piano+sheet+music+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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 16688 bytes
SHA-256: 7ffa9d120134401dc10502dfbcbaf91f77b0ef8f7c7452087d176b553c2166d6
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 11172 bytes
SHA-256: 8e5062078ff782ac6605f9320235dbfce2c490ca197a91c0a1f1746e3559f06d

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