Malicious PDF — malware analysis report

Static analysis result for SHA-256 205ec84d04ab378c…

MALICIOUS

PDF

107.9 KB Created: 2021-10-12 16:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 47176d6501cd7afe6a73bc3a63eb38c0 SHA-1: 638b732aae828a2d908ee99d7c45aa41f5ac0ed3 SHA-256: 205ec84d04ab378cdedc7da82e229855860a7ea6d61c127bae76b83728938b0a
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or malicious websites. The ML classifier strongly supports the malicious classification, and the presence of numerous external URIs suggests an attempt to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://jsptti.com/ckeditor/ckfinder/userfiles/files/96768815440.pdf In PDF document text
    • http://namuvaldymas.lt/userfiles/file/41800060040.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139121636041---vifopuwimisomerali.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vafowilon.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/dojavokuf.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/ganelewajuxix.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210924045515.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/xejipibetenugukiludowi.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/52279415406.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/efae3e5b51ce14cfb08886c708b6c281/dotonibofabapanaxa.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/fetiluniwidemozoguziki.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/33809685756.pdfIn PDF document text
    • http://dzerzhinsk.timebank.ru/sites/default/files/photos/pagefile/38576700415.pdfIn PDF document text
    • https://hsse.cl/files/beranenujuxar.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/guzafabexol.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/ganotojovoxugijop.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81995100323.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/zuvemaxoduzugapal.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/54959270870.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/niwokopobudax.pdfIn PDF document text
    • https://fond.ru/userfiles/file/fovafabovatem.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/899cstgldhb9375580k99ogdi7/tagelidutanazajukumadokog.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/51725734345.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/vijazalikewedosamaximefew.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=no+activity+found+to+handle+intent+install+apkPDF 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_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 19468 bytes
SHA-256: bff6f1ee6bab263ef63eb3d7a75b4a22a0bb4a96fa2d4d4540dbab026d4a4d3c
font_01_sfnt_off00016f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18741 10968 bytes
SHA-256: f1a5e86f987a3cc526c8454feca0dd7a2e4d72560fabc4032a773daf34e2ff1a