Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e4aca09c56d75f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 17:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c82221bff99363cf9808e4b85b9a0039 SHA-1: 4a8ed4cb09b75415e38f065c9b9b78d379444b85 SHA-256: a0e4aca09c56d75f6873c68d15ff5aa7f165ab887305f3783cdd955eab39393a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=finding+the+lcd+of+rational+expressions+with+quadratic+denominators PDF link annotation
    • http://muasamhangmy.com/ckfinder/userfiles/files/71556541663.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/xufunelu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/dolurelo.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bijerijijabuvi.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/97952068792.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/tubuwafote.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/78400864209.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/roluvinubasubejirago.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/nibivenedoboxe.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/24874797765.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/vapipafizax.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d510e55d---49452407848.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/jiviwuwefiwororik.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/83301944049.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nenesoxelaguxu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbacdf10c---lenodomugi.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xuvenuzapen.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/83229538886.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/gatefaxipowabimomad.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/sejunewazariwofoteref.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48712634534.pdfIn PDF document text
    • http://zl369.net/userfiles/file/36444579800.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/rafewigonol.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccc9ec56d---boxumuzilo.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 11476 bytes
SHA-256: b9cbc114e4f24d13bc47f8309d34dda76457976d41f888a41fe0995b1178b21c
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 18416 bytes
SHA-256: 47f7b11a4b9a28ce1513f8e69aa5ee110ebced01595a7774caeb068c6a7626a2

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