Malicious PDF — malware analysis report

Static analysis result for SHA-256 875be666f259eee5…

MALICIOUS

PDF

115.0 KB Created: 2021-08-19 11:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fa846a4be63ff29f7a31ab1b32fe3241 SHA-1: 21c932024f8a531fcf5782cc03ef40b413f3bf5a SHA-256: 875be666f259eee5dfcdfb885d178abbcd6e7e8653bd49fe8ea6d935525c65a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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 https://inwebjor.ru/uplcv?utm_term=destilando+amor+capitulo+13+completo+dailymotion PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7dc0bd6---65440306529.pdfIn PDF document text
    • http://flexa.cz/docs/file/nagubinegabobasux.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/12ea6e0410f2d8dc3469f026329b6b06/93624055261.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/gufupukanexufire.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/52229420809.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/3234355862.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/824f911f1d70518d1802c9dccf924186/13115505843.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/19398042586.pdfIn PDF document text
    • http://chinalabware.ru/d/files/10131332862.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe16e2b57dd---ledigezowopomevezofa.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/67232843688.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/919933786.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090215497154---16935330107.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9b34e63bc9ced8d79f8d5bcaa202e760/7748033194.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/27416401779.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/15248098789.pdfIn PDF document text
    • http://www.puhito.hu/uploads/65304747999.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/64413605590.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e86d8a8ce34---lebawububixufiremi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/kcapc0m5rfi8umi8baqk7mcub2/fasogepojuxepodot.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d91d1bad---16063024630.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wijifizo.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/98541690611.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/h30g5mjg3q32gjtanoie433gq4/97149975634.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 22068 bytes
SHA-256: ec814edb5c6494873e8a7e160962f0d8f2e3fba25a0a7660135121aa2ff5d3f7
font_01_sfnt_off000173ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C03 11116 bytes
SHA-256: b7d3ee5a470c1382b18da5edd0e04b1fcbe44b972188237d00d2a11630679826
font_03_sfnt_off0001a5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F9 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58

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