Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b0d2ca970e861…

MALICIOUS

PDF

91.0 KB Created: 2021-07-14 03:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1c507b04a05d56cdb223184de391231a SHA-1: b0979958899619e919b1688283cfc27509630fb9 SHA-256: df9b0d2ca970e861d98500d5eac4cc86e752ad27e9c39004f32b7167d1316afe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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 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://bandotrading.com/uploads/file/33113880363.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8d9e5f0428fbb9b0fcde767b78867c66/marituxunuz.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7d451d6d---somitixemijokukavow.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077bffdd962e---lunaride.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/04e39c8afdce73949ac9bad9cbc06565/34175832155.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/20eb4e2be78934e7293cff755eea7cc3/66711756966.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2r3nlf02eiuj5oavpuo3saneo1/galurusupesizejidimomavo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/71ec6432a430c097bd9381123096ae6c/22251533512.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/36659259642.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/39702620449.pdfIn PDF document text
    • http://deauville.ru/files/file/tatekujobumope.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/guragodazeweg.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa3c496767---vepupunukipudata.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/walelolejafijudamabiwozim.pdfIn PDF document text
    • https://digireg.es/upload/10192750892.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc05357e3---dakirujumiwojulu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345e5d78a6---fazujimudanekiputit.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c44f2ae8---raperaveje.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e6756c1b22dd3136a2a9dd3a283ceb52/latekanojemulefesado.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/gajubuponuvonetu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a0b76afe---36829667230.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be511e39a64---riwipuzufezefudebirimabe.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lajemudabaxovimorudakagak.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/11327883980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+tablespoons+are+in+50+mlPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 11000 bytes
SHA-256: d7a3ba0c34305e6e3b5063eda921060f41e3ba52553b39bc47c0f40aa999511a
font_02_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16120 bytes
SHA-256: 7cd650be26d854cfe21f1f4aada2ddbde382329d501a276ca3f46bbc947f3b5c
font_03_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 18828 bytes
SHA-256: 3ad331070bce6f87c6df67d731fb4ca3cc06a54b62f747031b4d7242f6d45977

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