Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6b0862bfa90a3c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2ca1c278a2ab3dbb11f59df75a051d2 SHA-1: 476a2c1614306f8f484695e0e53213872842d9b7 SHA-256: bf6b0862bfa90a3c0779027f7ee107f585910a7c568c53630bdef6caaf41486f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=listado+de+alimentos+con+gluten+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8cbbe1abdd466852fbadf14aafa89cde/61033071928.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/xotomifevuxa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/40jfft3fhh8421kp84pt80gg69/wamefo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acea9d18b---93862167132.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d61286a8c8dc02188d380f66940777a5/15910158788.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/75084881843.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5cn24i2a2nqorcr1n4mfuu16p0/88835360427.pdfIn PDF document text
    • http://devison-matras.com/upload/file/71813655606.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/49725972704.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d3e520ef4ed170379c031d8354fd2e45/47303116750.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/82321682661.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0d77f567---89514679346.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/tukezufebibuwasujeve.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/wapatogus.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec372564b7---puramatubogaxovavux.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/dixadukowajefumezipigalon.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/lefisavomagevezejosomovar.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a132fd7ebc4be98b7daa0779e861b5a9/deranasuxituvir.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/200ae0f6a8707ae7368db7a8801bef9d/89470366846.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/nhs5c55j2mn6n10v1anlsm0o4n/susinetux.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/97646408276.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a560a403304---dotibokigore.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/fivigagutogigi.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_off0000b9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E6 10920 bytes
SHA-256: 65ad3677cc83129335df7740cfe077bbc7d63fbdacd0d546adb2970429cc35ef
font_01_sfnt_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 16036 bytes
SHA-256: 37818c51265b1eb937f58a41f8a0be48ddd2720c8421b83a4ea72ecfa8e2c084

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