Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bfba58e8d39e96…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 17:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4a8bdd83983a19f4222573315f56851b SHA-1: b850c7a58438264f17e0768c6a90502d586e2b03 SHA-256: c3bfba58e8d39e96828b3533a33808bd527f03ae876ac40d883d2c2803ca9a44
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO poisoning or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=how+to+take+a+screenshot+of+your+phone PDF link annotation
    • http://security-m.jp/tool/images/file/75944586067.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/911676295.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/gasekakukewedoretivunub.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcc472b23---fidux.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396dd36d529---kejisefedufutax.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/55989049130.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/93785901296.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/16179102442.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/jibirutoxuvusunon.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6baed1812---fipuga.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109161956366093.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613670e235a38---fabenevefoboputogejofej.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/23116251542.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/1922732848.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/rodunadagisuwilukebisire.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/23316306951.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/bamonodilivurasolunulox.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/lenufo.pdfIn PDF document text
    • https://negaratoto.com/contents/files/80227720308.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vekogarelobipo.pdfIn PDF document text
    • https://wittnebel.dk/file/nuxasirunarexinor.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/89463249399.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dojigirinaf.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/wifufagugujonadodak.pdfIn PDF document text
    • 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 10824 bytes
SHA-256: 0628d66d287d10f2297fdd7f7559124289f5783dec9f8137ba006ac6d2d01a62
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 17652 bytes
SHA-256: 3b47c19d2c1b0db8d9b3b500adb75e52e5061ed396796a794b521fe96493ec1a

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