Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98546f7f3fa728d…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 20:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: abfc5886918c3f6526098f7ee5f3e8f0 SHA-1: 22b3c1a75e0555070010072af5766d2b4072855e SHA-256: c98546f7f3fa728d6c21153fa44c2fa2824b0f14cd60fb34b05c94ab1b129338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to manipulate search engine rankings or redirect users to malicious content. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://laborke.ru/uplcv?utm_term=lewis+structure+of+oxygen+atom PDF link annotation
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1d93cde061f373f04ee08662f3fb7bd8/konosagijaxoverak.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/61501bde5c11cdc32b2bddff20d4d39b/17813766028.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1866e0012---mepagik.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de7519a70---towuzedozujun.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mavufurexosu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/ravewiwusimafato.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/501221e535da79760a675136d072b5d5/24615911907.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160884ed74d248---14804633334.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/91878095343.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/sepobukopedoderigakasunuj.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/424d00e514cbe3879c469732e5ae0066/97021218179.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1d2e3491---zuxuf.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/o79gdgi3fqat243knsnpoveuin/8494393116.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fbeb3750e9865c15b770b168a921755d/321642744.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/68081683272.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca2919a87---nisidixemodaxabugugufam.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/zusexavunikitu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/5en2u6tanjde2d8026sep940dl/21491974047.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/ronafozuruji.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2804594498.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/38a913d5fc7859d3b986f9a3889d4807/pabetogivura.pdfIn PDF document text
    • https://service-panev.com/userfiles/nosiwasazigumofomop.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094073d85595---niwewimumuligitorarawo.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/488b5e4a8869fc13adc3b0d78a8921cf/89367039187.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6fb1c646---61209390630.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16688 bytes
SHA-256: d5ac0dc1e4e74225cee4d866a0339d9e0e857a6356843d5757bc29b9c02c8d8e
font_02_sfnt_off00014a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A55 10992 bytes
SHA-256: f1032f28f299f5425c0bd9429ef4f9fc53056601a1f2c2d5c050a6b8afe36153

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