Malicious PDF — malware analysis report

Static analysis result for SHA-256 30938f8db546e3ed…

MALICIOUS

PDF

96.7 KB Created: 2021-09-20 00:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73891a148003ceaea5987836d8c5bdd5 SHA-1: 7e5f507e603ab7a678b61dc85cfb85d2749a75f1 SHA-256: 30938f8db546e3edb4504bdfae80d9cc1cc348d6bad1cd46ebc49a18d263b7ce
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external links, many of which point to PDF files hosted on disposable or compromised domains, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=mcs+e+warranty+android+app PDF link annotation
    • http://mobil-tech.com/files/31293893718.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jegokilubuzag.pdfIn PDF document text
    • http://prompol.com/media/file/18218807563.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/todelabesonoxaxa.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/41045919481.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/fewalaxu.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vatuxugudesudelawavek.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/kumilireginoredi.pdfIn PDF document text
    • http://iucecb.com/files/file/tezuxevodeb.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/gogadotopiwo.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/tisakafupiboda.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161415556d63d5---98876407775.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/zulajadivedadomek.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/26694098129.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/55466210315.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/30910234342.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gusod.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/roxulepuvixu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb15ecdb9---bonumutitirirosajasukeka.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/29916374904.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/xudafizalugazazapomunen.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb2abc3e6---77973532104.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_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10656 bytes
SHA-256: 8d561c9fa59f504f989f545c69147818e26e74ef4297418c4d0db18f68513b2a
font_01_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 19732 bytes
SHA-256: 8af8c06992dd5a2cd16f102d231353abfe0803c86c436f9d21f6280e1954fe85
font_02_sfnt_off00015d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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