Malicious PDF — malware analysis report

Static analysis result for SHA-256 198d51c20ee1daaf…

MALICIOUS

PDF

76.7 KB Created: 2021-08-19 02:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10b9160aab69daebab9a282e6cc53ed7 SHA-1: 99ce202cd752418bffa0b7ab3a065bab350f5995 SHA-256: 198d51c20ee1daaf8dca754560c2cd3f263c089010995649f19c6e7e058d4ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking discernible user-facing content, further supporting its role as a malicious intermediary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55312449226.pdf In PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/16492930389.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0629c3ee2d---kulad.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210617_163328_1612.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7468a170a1cccf1f9267d9a1027268b7/gatoporelakuf.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7rssq93m83fkcgao8615shp8rl/52650678103.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/734b45a05e040b6662e36c440dff8466/96360908323.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f3675d99d42dbcf39c8479566f2ca662/86246613962.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/7415428639.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nu1io0f1qecl1ap2d3bprcv3f0/47547672897.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/kibukekusedijumalese.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/23565836025.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/tavorojora.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rgru5gt6iek8sr54797ijenom0/jazuzopasatonilenom.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/pusasapuzekivuvikat.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/32124512652.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/32301987802.pdfIn PDF document text
    • http://klhl.com/userfiles/file/pimuzapusewowodibitaxoko.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/buratudodiva.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/98284312511.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/82899fec852b0654f4bb79d0a012f7ff/kedotuxofonofigepojes.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af699e5be---godewowuwuro.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/tutagajujuwar.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a96994c3821---89429365832.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/tajuzisida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=navneet+maths+practical+book+std+10+solutions+pdf+download+2021PDF 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_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 16480 bytes
SHA-256: aefd66acff468d8a7f80e16a3be8cbd185f47ca71b1d988855fca41afadcf329
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 11640 bytes
SHA-256: 2a8b5d301e0ab8f39815c45aea0a4ec178219a8e66924b601d21701a1b632181
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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