Malicious PDF — malware analysis report

Static analysis result for SHA-256 519fdce999e14ff2…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 06:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b3a6af874674e5714915359ec8b115d SHA-1: 80923bf1e3ce04b4ab46d1dc993a83ca67dc3851 SHA-256: 519fdce999e14ff27146502dd3c6b5b7ab5ae6b8e2d8f6c6734939ee940e4ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The presence of 'utm_term' parameters suggests an attempt to disguise the nature of the links, possibly for SEO manipulation or to evade detection. The primary attack pattern involves luring users to external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://sushiyaslo.com/uploads/files/97993512095.pdf In PDF document text
    • http://apex-architect.ru/images/file/ravijek.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/0639aa00b6ad9f1a5c991bdafdd525a3/zesazasebevuxew.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jamatunelirazuxisef.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/23553b0fd9d5a216184704621dd5eaeb/20893153844.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad0529999---99080711831.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/23501700924.pdfIn PDF document text
    • https://begili.com/uploads/image/files/fobaniboxiromevipidukej.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/27796477645.pdfIn PDF document text
    • http://laplacedesstores.com/upload/file/73769542117.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/jorin.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/93337270065.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/e8a24e449ce9287126fe572a2de52cf1/razatetonunobediwo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/43998995478.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/mobananizip.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/linumez.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/wazomizeforofepufebojek.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lamak.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/50931079508.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/af3d6e91876288ad276e1add61dcf57e/gekowuborikuk.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/wenafol.pdfIn PDF document text
    • https://asiahijau.com/contents//files/27889367240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=social+psychology+and+anthropologyPDF 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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 17284 bytes
SHA-256: fc9a9fb61fea8a88c562e7381a563952f165c50b4d07a85ebb8b62404268edfd
font_01_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 10848 bytes
SHA-256: 89c72b9e86c2cb75d8c8396fa3bc8ce19c5f0b643a63992a403c602b5907d0a7
font_02_sfnt_off0001382e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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