Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cf1da743c90478…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 12:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f174f0744e3b23d65587626fe399d2 SHA-1: 002e4d3922979b287f0c64c80421737a24cf1abb SHA-256: b8cf1da743c904788f1a3724bb887c7738dfdc0cce26e1dc0024175ecc3a5b80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest potential for JavaScript execution or further malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=how+to+grow+snake+plant+from+cutting+in+water
    • http://afgventuregroup.com/cfiles/file/55387821447.pdf
    • https://thefertilizerproductionline.com/d/files/5466874677.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/165c493db625170c4ec1a3c8a5d363de/xizefikenuzokive.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b4ca6f8a---wokilabife.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b13040cd223---neziseda.pdf
    • http://zaun-produzent.de/userfiles/file/damezakukokiwali.pdf
    • http://dreamcatcherltd.com/userfiles/file/1862014028.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a0e0804884789572594f83ba915464f/51555472483.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/6680747242.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/95708116749.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cda17bac0---lawosisusetu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69da5d8d9---sowovafusisoguxeze.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/topada.pdf
    • https://alakharia.com/public_html/userfiles/file/92090306163.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbd3f00b3---mogozevolanirokovatudubif.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911578989b0---50972248260.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087071db9930---ladorinitukuwedivosusadem.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d9a83e1a35f55b51266b6f4ca29f8eb7/nunisigedopavenexinakalum.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/91298356cb390e24bfc6f2a5b77d4f41/54274879181.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s8nsmu6q71c6nk9chvs60divbn/mekasavud.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65c16337c---wirixujorijudotu.pdf
    • https://amatnieks.com/pictures/image/51757075900.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf8188b915---75575297972.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0b.bin
a873dcc18a0657a94c36bbee73a4fc4716486419f76dd77136dcc8af3f54aae5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 16740 bytes
font_01_sfnt_off0001274c.bin
418519691772a0589b0f174035c7a5800f39754e8f6934add85d159707ddf92d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 11092 bytes
font_02_sfnt_off00014131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 16792 bytes