Malicious PDF — malware analysis report

Static analysis result for SHA-256 c179d155a1e8a40a…

MALICIOUS

PDF

89.0 KB Created: 2021-08-01 04:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee649ceb047798a5432a21de37ff922e SHA-1: 1a58b02034f1bdc4f752cdfcbb2994befe0c6e40 SHA-256: c179d155a1e8a40accba9a4029f3c0205d706056770cb57ea2430bcefb7ad4cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple potentially compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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.
  • 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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9715658100---gizalabogaponibogan.pdf In PDF document text
    • https://campermagazine.tv/public/file/13328421388.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/53273832836.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cbde8c68c---11280663901.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826618db3e9---19872382794.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dfa657a2a---bemomalotajobuwidono.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/24241587753.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tepotomuzevoleja.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161044a2a408cf---56715731860.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1aed6ddb24a08a8651e21920b1c00d41/61370980812.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a8003574---tovavipejegilabivatu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vizafisokadolulilob.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/65520345033.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/jubeniperubatenofesoduvap.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/36124193642.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/demoboxofepunexuzijaza.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdc768213---5555478105.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f0d5a9f6bae7bc23ad07e03e10c4f561/62213828901.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507030449111.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aad6bcef161---gilugobivitifemur.pdfIn PDF document text
    • https://medtek.vn/storage/file/mavepotojipedugidikidoj.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3d18c4fbd5cb22a20e225532858bb131/lujuj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdecd0607a---29217426932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=larousse+gastronomique+pdf+%D0%BD%D0%B0+%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%BE%D0%BCPDF 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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 11932 bytes
SHA-256: aaad1b1599655b371a47aae2e291d479a24dc1abf3fe3bf36de7560b068e5bbf
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 22708 bytes
SHA-256: 74b6117acaff363f90324cb27a375f325cd58be37d31c94bbe4fd1376dcd9721
font_02_sfnt_off00013b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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