Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe25bc1f3e8b1972…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 16:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 982805a7239744640c7eea136adf9bb3 SHA-1: a57365fd3db49342773c2c7243059e0bcb777e7c SHA-256: fe25bc1f3e8b1972c2f08b4e5db31be3d8c4ae8f33a0da48c1d7d1c350ce2bb3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various URLs hosted on potentially compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to phishing sites or download further malicious content.

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://leganordavigliana.com/uploads/file/6751031721.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134068041aed---4350788405.pdfIn PDF document text
    • https://phm.vn/upload/files/jaxipasulegogijalizegome.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/47841806158.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/neputigorazur.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ccefb441f76c65b86856d01fc2555e83/bifuzomorudolufig.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/66447496749.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/tefibowokebupelotisulexok.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wamusazazipoleganuderoni.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/7004745353.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/385627216.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/6128703500.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/17989184771.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/zuzupaxinolejamaki.pdfIn PDF document text
    • http://ipllaser.in/uploads/35110246838.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/2960052744.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/88711091992.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/16382289661.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/20803655875.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ajk8u5vto6l3em132ttjije2m/xizoratemi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/7615478250.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/71528361984.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/99200425473.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/zozanuxeditokorexadoviduv.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/50398047547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=http+go+recover+accountPDF 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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 10400 bytes
SHA-256: d4d9841f9a0de077502d68bcd085394dac2f5ea42dc4513078342cef4da027df
font_01_sfnt_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 15272 bytes
SHA-256: feb7fa32632dbde7a9a828ae3055687e73b99311a99256e352814992b344bdeb
font_02_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1