Malicious PDF — malware analysis report

Static analysis result for SHA-256 f198cb8dbdc93088…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 02:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 024b28bc27820270cfc5858379337f1b SHA-1: d706d82f5fd9bb1a38da50f3924d7f5eaf4d2253 SHA-256: f198cb8dbdc93088488ae69ae2e1f86c579887ccdcf7fdc0ec9189d5814c20b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure itself can embed malicious JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1b2aa3bcb814c4472f9c1c35470a53fe/39121457176.pdf
    • http://anatolianlgs.com/userfiles/file/zokegute.pdf
    • https://safrano.pl/userfiles/file/ledetomatarojuzatula.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ca93ba72---46845425580.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362c9118a1---feninosawigurejujifel.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0c916700---tamanusariwulo.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/24558bba9ba62b2af68d1a35a3f8fb9b/32854832464.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dpnbfrvehkre7avkumr2eqvh61/85635672304.pdf
    • https://aawyx.com/sites/default/imageuser/file/34105156921.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee11e2c81---68271016697.pdf
    • https://amd-export.com/site/upload/file/28106094861.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/015a55b5f38405979db190e0cb272754/83264027628.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6if1hrbrhsggg1f15mathvssc1/61524503752.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4bd63945---82505514459.pdf
    • http://ackerviewguesthouse.com/userfiles/file/fowinevabilo.pdf
    • http://aire-limpio.com/img/editor/file/15580612536.pdf
    • http://www.jindatunnel.com/up_files/file/24955201752.pdf
    • https://gelblighting.com/userfiles/files/benajezivejudiwapikiri.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/22f32d9ff36c9a4803826b532407169b/93036801991.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f767261a02---lolekadad.pdf
    • http://bioident.pl/photos_fck/file/boludoxeta.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f0f58eb339e5490695924a705e95ac7e/12904298182.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/jadinoxuwuwor.pdf
    • http://clingac.com/d/files/kewasu.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2d0a4db908c8f46a9d0b12c2a199f33f/13757205918.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/57821d0dad8c3d8c4ebe83e053eac0b6/26514470840.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=empires+and+puzzles+talent+grid
    • 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_off0000f3f4.bin
113045ce185b3fea02928b5a2885998b1418281802e4f1cc672d6143df177a52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10756 bytes
font_01_sfnt_off00010c76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 16792 bytes
font_02_sfnt_off00012488.bin
87c96041ad7ce7c16e36dc61b3116c075aed9c9e17bca65ae86043f22a2f4f23
pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 17468 bytes