Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3c3d8827defc9d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 11:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87c0bca8e5bdd659f6505ce00727721a SHA-1: c0f605a1c1e0f7fecb762116bffb16ea91555b0d SHA-256: 9c3c3d8827defc9d55f26a8670bbcbf14b3a4d7d9c8e0ad32c18b340e7e8bce1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097c83d9d51d---gutam.pdf In PDF document text
    • http://www.grifin.sk/files/wulijajobibodetitalojoxu.pdfIn PDF document text
    • http://homeopathyhongkong.com/files/19919347050.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cd5f861ba64ba702eec401e2654eed04/lozegemedepud.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610eda11d8de8---jerojatibi.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pumibemomurolozutew.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/lokemaril.pdfIn PDF document text
    • https://coil.hk/upload/files/11697221751.pdfIn PDF document text
    • http://polipack.ru/content/file/66168593189.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa4b09f3a650699da2dfe75df525f1bc/disopexowedonobi.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1fd0f8eaf7a4afa3f4f632e903027bd1/12063029269.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/midiboxa.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160804d6e579ff---jeribigoxajejuzuzefeno.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/hn8tfoija99iarkm0216rps31f/zosajebirojok.pdfIn PDF document text
    • https://motoralbini.it/files/file/74056540662.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/boduvusobopoluzasike.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/bomoramuxeso.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608862ac4699f---kanuxovanepomogixan.pdfPDF link annotation
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc92ea308a---20827395705.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/71e22475c7fc8fed91f0e521ac537f0d/dafodamufunid.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/dubetiwusoligirabaxevimix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bar+graph+worksheets+for+class+3PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/638c3548660b215254c37cda325ddfd0/motob.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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17352 bytes
SHA-256: 0c2bada8549ed5a7754138790d5e1747b876468e264a548432b5d3e4af45c7cf
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 10968 bytes
SHA-256: 6fcdc63a2c93ae5a54dfef314859fee907fde57e1b14eea630741b54aca17399
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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