Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f4f1b39e239fc9…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 20:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1720ca3c9c9180a223c71de88f2a915b SHA-1: 9f8365bfe6cb12cc88e4b24c36684ff2b69f718f SHA-256: 32f4f1b39e239fc9acb0f326801e888e5a9e1696421b62e0395ad0f4e84c87e8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress upload directories, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=les+diff%C3%A9rents+types+de+phrases+pdf PDF link annotation
    • http://novastal.pl/userfiles/file/93732939460.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607784e9e4b7d---jijolebalakekenuzedonu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/69752973600.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021731138117731.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/488ebde5259989a1f529d8fa45597652/67593327388.pdfIn PDF document text
    • http://cke.hk/userfiles/95869937653.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb9a23b628---pojamagagopolopogeli.pdfIn PDF document text
    • https://vestol.bg/files/file/nonowibegexalutovi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081315373366---jogupetaga.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/13471643373.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc266338---buwosilobejimuronerigiwer.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/4625040850.pdfIn PDF document text
    • http://halmar.info/userfiles/file/vifegejukojatik.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/201db1f8ddaafebe79f598e45105db80/defatefig.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612187259c41e---fuvitowiluwu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kapud.pdfIn PDF document text
    • https://daismene.it/file/domifagenu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b8235aaac91338c63483f00f5b522cd5/37613982776.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a3cb5b07---70347267278.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43942824438.pdfIn PDF document text
    • https://foulardfotografando.it/file/lasisojebu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/48197170451.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ipc8f72g251t05b5arimrcsr20/buzojapederaguviva.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e410562b872---fabovifizifipuvapapusexiz.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10656 bytes
SHA-256: f6aff31a56f4f7004558cd3701dfafe8ad97ffee49c10b03cd3186bb54be4301
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 19432 bytes
SHA-256: 9b25861cb24fd2e500cd26ba43e8ed837d1589d80428bc4c3d742d93de8857fb

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