Malicious PDF — malware analysis report

Static analysis result for SHA-256 5304c6bf503a6a42…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 13:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 563ae8ac4d5a1dc0f2d02cc73ade6190 SHA-1: 6379db73aba7190eef5cf2dc49a90d0ac9ed0553 SHA-256: 5304c6bf503a6a42f15e5cb3e32789bf62b7d71c87d383158878ce79fca7a4b8
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute further malicious content. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to algorithmically-generated URLs, indicating a likely attempt to evade detection and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb14514120c---41710988342.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/wagatewuzozu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/10389413235.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b426adc23---wuzagepukulejugozawulet.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/lf3qrkuhuoka55kkn9rccdm9pg/lisebatog.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/695965e568eccddbd258bf88223bc90f/vusoleludono.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f328bd68bbe---rimebunak.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da9e7abaf---37518905652.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1be1ba44---gorov.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75294907000.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/nefidadisapixide.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/kelupujemetarunipabazutu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ko4b1qshsd0ti6qsr3ubn0un62/sugaz.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/75188575856.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46086810504.pdfIn PDF document text
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/72696543210.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2a71e486bf1b2b2c06aebaeeb6c20263/zisonovibusuvodekeji.pdfIn PDF document text
    • http://mopron.ru/upload/files/33062099786.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/lakokopaduxij.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a293e71f7---xekinu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/1723030289.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/i4h4b9pju6pu0sv6bu1bnbjf8d/56909761830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=calorie+calculator+kg+cmPDF 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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10524 bytes
SHA-256: 8b778c7280f4060f1d74dd8d416294eda8b9eec1df8cce2940d1cbda83085a1d
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 17524 bytes
SHA-256: 24bf87c58f406e7daaf09f08922cd7a02b6e2958077cfe548f89bc1dda40939f

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