Malicious PDF — malware analysis report

Static analysis result for SHA-256 45af940c618e7ec7…

MALICIOUS

PDF

100.7 KB Created: 2021-09-17 08:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f3dd21744cf2b6d95151c883a924b1a SHA-1: 4a15b7ac2771dd3e6acf1f696e06539fab0bf8c8 SHA-256: 45af940c618e7ec7629094b91847a21cdf1932e622ca774609a4a42b821b2e3c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which are part of link farms hosted on compromised or disposable domains, suggesting an attempt to lure users to malicious sites. The presence of external URI links and the compromised CMS upload link heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://pixomot.ru/uplcv?utm_term=lucky+patcher+2019+download PDF link annotation
    • https://ourguarantees.com/userfiles/file/15800428806.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/rivumukovukupivekazaze.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210916214619.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xexutumupejotowerago.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pakomuwiguxok.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/33206471591.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeefe1d340---53837667850.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130058a8176c---xixonok.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/8830117112.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/banapozumovifidowe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/60a208ff22e0970559c8558511b955bd/20224764290.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/fatisidojeg.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/48385196327.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/dizozi.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/wiburogokolepidetuxeke.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/dikonurokejolotis.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/17936444587.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/xuperijirisuzidozik.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137d85cbeaf5---niluwo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9c0cf5085e15db43a4d496f2f52d7ef8/tafeweva.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/lelopegatopo.pdfIn PDF document text
    • https://hojoairport.com/images/file/fuderinofuted.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/basaposesasigaxibusupeba.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16608 bytes
SHA-256: 81ffecb073330919145d4ab27472d8d45266f4535ac295bde374e7d3db9d30c6
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 11164 bytes
SHA-256: e363615edc697a3ae809bb5b6c08078cfd8c72ac968fe9b937bb0861ef5ca856
font_03_sfnt_off00013472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 27976 bytes
SHA-256: f005b4bc9c2337563ec2d43a5e09d87ca50ac360200de383cd21b0812b51ddb2
font_04_sfnt_off00017802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17802 2468 bytes
SHA-256: a4d16cadf217999ac254515d423946a07bf7bfa639bb5a5ddd3629ee12bc1112

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