Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f56a3557a680390…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 00:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 428dd713ba2c9c678aead3142dc2299f SHA-1: 8acbef5aca553efac7786cc3cab1d0711cda32fd SHA-256: 5f56a3557a680390deeda43af5cce2df82776630d89ea9852a775f768938e002
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=examination+in+chief+meaning PDF link annotation
    • http://itfind.ru/uploads/file/wojekenimuredivusajo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd2da40dd0ff34b9955431fa43447500/5147050880.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d15586962---sujad.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dakavodokajosogofifiriba.pdfIn PDF document text
    • https://laser123.com/geektic/files/zawafa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160984a369ebe2---xojajitowizoxur.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/50027348189.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429a02860---jibosemarinulanif.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/dolozesonadizufow.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/wekoxoxibowegiwipo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/somusidulupozulab.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a63a3ff5---54286613914.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/mimevawirubowe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a25de66f---lidifudosoxozifibixepaz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8b2d9934---munixidanopewubarovow.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/53747555493.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487b00be7f---71433876020.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6d07f27e---jesajidisajumu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e10a168f7c---mevikimadexajuzavetigodad.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621077569.pdfIn PDF document text
    • https://hagepoorter.be/files/files/moxunoduxabonadoxavox.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d11d2ca3---78501072308.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22875704271.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/95886396518.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 21844 bytes
SHA-256: 3aa01d0d4daab297da8a64c63b0ebb2f094c6830008ce9d1a7f6468c080981f5
font_01_sfnt_off00013bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEA 18068 bytes
SHA-256: 4194de609dd52b3c5db1919198e936b475f17fd070e3629c33957bb3db5a6121
font_02_sfnt_off000157fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FB 10552 bytes
SHA-256: 36df9516dbd68149688c22e2f0f949f9adc157ce0e63e89b6dbd336d74b33bde
font_03_sfnt_off00016fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD5 3432 bytes
SHA-256: fa99a948e2e1a1d0f95b37a7e12f429fc413255a930682568fa5674a58c17eca
font_04_sfnt_off00017d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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