Malicious PDF — malware analysis report

Static analysis result for SHA-256 b178db937b8b615b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 07:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64cb1154622b48f98a52cfd00fffec5b SHA-1: b0a7ddcdf4ef77f020eb3744fe7bc35f225ebe4c SHA-256: b178db937b8b615b9b8d3cc89fe5a5c66cebd59d0eea8fefd3750a8c8b188748
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sport-jicin.cz/dokumenty/sezopomolumimefunukusoru.pdf In PDF document text
    • http://fjsxsx558.com/upload/files/17705470.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/37930449330.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608534fd3599a---lozodexutazowitaduji.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec41a67b37743d13724d1638f4db7fc2/pizutatofanopuzevek.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/69d60cd1721139116193b3b49e9e52e5/damevitunav.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110621526fd9---57303107944.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/zevumuvaxetota.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/77290674053.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d0do8kp1atqb29ao9ml884n7ov/37919187522.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783524c6788---34116068326.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vesinerixab.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/95510653386.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f8dbd298---nigokegitobusinuvulagiliv.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16238da764---49161025406.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zosisex.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/21088816542.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/27827368031.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/34513631820.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/39711731383.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde60d1077---25351683321.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/vixadow.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729467e2596---16819981709.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2b9a1d14---tufekozesakusunixinapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+long+videos+on+discord+without+nitroPDF 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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10732 bytes
SHA-256: 0291561f0bdca089f789b5e1a39b4d7e69731c97206850ed63b6eb8578cd6152
font_02_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 17428 bytes
SHA-256: 5526572f5500669abba5cc56bf2c4219451766562707bb27a45ca657e3295f17

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