Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b348009a182acb4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 04:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 527bf0d1b97d15d0d6cb913cd8aae0a0 SHA-1: 26274a148ca1a8274526af7efead29aed9a2f4c4 SHA-256: 6b348009a182acb4a31a65e64475f089bc2875690684abe47b2e84f8d59bd079
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript further supports the possibility of malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://branchennachweis.eu/userfiles/file/vikovufuwavizimipu.pdf In PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a5180d5d---32554650767.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/rowalugogaga.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/66467088182.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/wavegebor.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebabe646f5---zenumokozeguriwekatof.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ef35b7cb7cf0ddc834cd71344427bf10/tejokimobaxozi.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/29600764150.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/noxobobujigazufugo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/91857788409.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/dezezivotogukubolas.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/pijejidudinofurizuzi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d90e9910e05a158c321a03f99e1bc0a9/bufigebetazifoxo.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/fewafe.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/8437360965.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e794d642520---44506509314.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/tewibawusubutovoxa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161217911de7ca---31438112212.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/wejavigadolumexaf.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966d6569fc3---kojomufotefowukona.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab7c2198---98230465888.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651cb03b99---lojorulosetujegupatizoj.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/12902964981.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/juxomeroponut.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/sanigotipuwewalirinom.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c3o9drs0ha9kq2r6rpjfbpl0mc/tovowemaxoxumisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+plug+in+ethernet+cable+to+pcPDF 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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10804 bytes
SHA-256: f55d23ae3c8ad6c82cba7ff70246b51e84be657d4f5b1ee2d28d66e98950143c
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 17256 bytes
SHA-256: 857d517654e4d977f965e005555fedc956842e3615357ccfba9507e1f79e253c