Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8cddf616a0e252…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 11:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fcff9cfabe44ea9c2db4cd826b36641 SHA-1: 4fce30be6e33a7483aefaa928bdb2d938f19977f SHA-256: 5f8cddf616a0e252a41595c6dbe69aefff53a2024384ac26464761be103cdb72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct hosts with single links, often with UTM parameters, which is common in SEO poisoning and phishing campaigns. No scripts were extracted, but the presence of external links strongly suggests the intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=mechanical+system+in+control+system PDF link annotation
    • https://biothiennam.com/media/ftp/file/44417067259.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/fixobo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4732545819---tabag.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9cae596d---pekatenobabipukad.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/62642750471.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1839d3ad86---wowemupovuzorubiduziratip.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/69001836029.pdfIn PDF document text
    • http://dakmet.pl/upload/narifomimixuj.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e55dba4f082e62f5d1792badb1383928/75554092796.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8bf33ab1137e46518b9a6a65afc95a5e/6292254607.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b620253287---mebegowelosapa.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/2519911628.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fcd45c16---vezurotalunimu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f089f20eb666c0a7a4c2fbcd652f7d3f/745121684.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075620751663---tuwoxizirasupibif.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add02a17fa3---30290016046.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/jumadukokivetivepexi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a456549ab1---vumojesa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9499d7be---megonoravu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dce3eaf7e21d8f8c6890753942be9219/xidusixejaga.pdfIn PDF document text
    • http://wenxuezj.com/images/File/470190579.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073dedbdb2cd---dokudogupevunafolabinuni.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/f1bb8e016e428152798e14582850fd4b/12911992033.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/89370592646.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_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 17544 bytes
SHA-256: c77057ffc215e5f2909eaa8e6af19d669d36302bb30d1b7c5a22ddb8c26adf3c
font_01_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10604 bytes
SHA-256: 21aa9973cbf2681257b65415163d680fcbd866f62d894bf4f196d30ffb5175c0
font_02_sfnt_off00014494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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