Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b6b1a963ce60c…

MALICIOUS

PDF

85.0 KB Created: 2021-08-17 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: dc175d3a6ad3b6c6420c7e9e2be68f3f SHA-1: 357d77a706f91c11cc69452590c080aa42b584f4 SHA-256: a72b6b1a963ce60c006bbe2635001747f42d6907ea3f700fefe4805ce064e0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1241cb4c2---lilowalifuxowidarudis.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vjnc0l1lofrru8n9a373hivo44/dexulonanuseganisila.pdfIn PDF document text
    • http://farmina.ru/uploads/files/zudinavejulowiw.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/7465020502.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8c20fd4b---48934024878.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cfe558634---xewasazixulifel.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/furirotoweluvazidale.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kasuxumoxipokajufabubopo.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/68698155634.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6dbec07b3---kanugojirozosu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53d59a60a6---gemeb.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/terokisafov.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3511baad---xuberuxuxagovesovelevof.pdfIn PDF document text
    • https://vestol.bg/files/file/janumalawo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608011e8316a8---64726664545.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/97942864911.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gsr427m0sk6hatpis30klevb5r/30983578445.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb274c471d---gokiluwezixip.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857993c6821---dugezibotifuberoz.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/38157400795.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0a84a184---jobefawabiwopujike.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42de95abb3---zivogoja.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/65c27a2236f3a71bc165b5f9bb46a09f/nubatof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=imprimer+des+lignes+pour+ecrire+droitPDF 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_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 17564 bytes
SHA-256: 53cce6334d33f2cda517f2a8c05d2446e45f67eca8c16aaa69b7e6ccadc86653
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 10744 bytes
SHA-256: 3d88b316981022fbfa76b49e110558ef10fb7508266b0e2da293afaa5d43dd1d
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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