Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38756cb62b17fd3…

MALICIOUS

PDF

89.0 KB Created: 2021-08-03 10:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2a9a32e32ecd96d014c66b9021ddf6f SHA-1: 6c8fac669cd22963f623bffe41ccb4e1eff3f819 SHA-256: b38756cb62b17fd38b2aa038039cda54f782463aeac4eb9d5b470c2f60b6f063
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2665d2f368ba1b244b2cf2d595722103/lurasosoro.pdf In PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/mositisul.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/14727932746.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/90618575522.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/zilowawoxa.pdfIn PDF document text
    • http://dnepropress.net/files/file/suwaxazifajegaguz.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/busexugogaba.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/99991631861.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/sobozoxa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607036925093f---gorejuketut.pdfIn PDF document text
    • http://wwstationery.com/files/file/17884846681.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/16925665136.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ec8258149---74094920254.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/74124766752.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096102eb8f---fifurikolilabisojo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e5598208---95299282370.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5r7uufocdv6ekbjl1iurfenhg4/xogelobaxub.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2eb498754---sifuxofokawupebumoduduf.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ae9eb3b93a3332ca5487b7d2a2ce0265/92446828272.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80847087747.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xobefidozijusire.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0e82784fe03ff982b049369dca8d8c1a/lokafaroforawigabik.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5b1a98470cb385be10db0cb849b22ba0/mosawadufujapasizavin.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/69146679600.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7957aa6224---xurokitifafisovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=firmware+tv+box+mxq+4k+downloadPDF 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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 17076 bytes
SHA-256: 12b8d425bf51e689b98049b67ea9838c15287d462ad0273fe306e403239cf7a7
font_01_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 10928 bytes
SHA-256: 6d7cf90db5ece75b10caecc026449ec04f15350da0ace9b85ccd21e3646fd1f8
font_02_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1