Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfef339fd3846420…

MALICIOUS

PDF

99.1 KB Created: 2021-09-05 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bd824e28c5be54cae0c10727fea92f5 SHA-1: 74bbfe38363a29baa7589112e3a2e83cde4932c1 SHA-256: bfef339fd38464203ba0030808dc05ff26d36f979e59d6234cbf0a814f9a4647
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating it's a PDF phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external URIs strongly indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tulg957vcpo7fmh1s5f78pdh0u/kifoludu.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f02c2fe0---xoxuwokelazapabeteses.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/sugof.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/jaworipuwuxef.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/genazosofudepet.pdfIn PDF document text
    • https://playpenghu.com/userfiles/file/kixutezekutewisadufe.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/pazezomibepipeselexikel.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2d6c7ed848e8fe2920eb5378d070a440/merewinadadodu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b5845a6b---72004883187.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0rstidte6aurdqkpfgu6rs4ef0/43916724750.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/67406601332.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/16940584217.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/lodizunebonotipen.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/79459290300.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/29927198496.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec7bee5987---92526799187.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fajexopolezufad.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/masuko.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a206b5e03a---serozigekoxubefodujal.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vikilofipog.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c569d5f391---wafepijijot.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pigilazomukabuki.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/97042819558.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/wovorizemofuvimowumez.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/41951011224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=distress+respiratorio+en+perros+pdfPDF 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_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350F 18924 bytes
SHA-256: 633961b32567919fb518a24c2d648be936291605a72c2ae48664fc7e173f544c
font_02_sfnt_off00016662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16662 10448 bytes
SHA-256: 636e909d46d4a6c057cf34450f11f7b4948d98518c04c95bef352b79ba737261

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