Malicious PDF — malware analysis report

Static analysis result for SHA-256 8266e752b394d2b2…

MALICIOUS

PDF

129.1 KB Created: 2021-08-07 02:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 85c67bdf5e85074ecc9cdf8e8250112c SHA-1: cc5455807b538f738845ef4cb230a1f433aeb63d SHA-256: 8266e752b394d2b25ba9a524258b6a0b74c8a3fa60e300e0f6ca72b9a7570ba6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories 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 through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bitite.lv/media/txt/122/file/kagixitu.pdf In PDF document text
    • http://www.kevimotor-rock.hu/files/files/50867396705.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2a3koprkgg7c6t3v4i9ft8ueb0/lubifakewigavivagoluxutav.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/87778964090.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qaem543e51vfe9oekols65effo/13952811319.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091542b1a882---tixovasa.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54421bd5df4052d05f96e541270867f8/somifise.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e63b10d5d6---vatasotefozejabini.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b87d4c8ff824c1b999ccde75cbdafab/xiridugetuzarom.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/16648424060.pdfIn PDF document text
    • http://contextuae.com/resimler/files/xemikapuluxizusoga.pdfIn PDF document text
    • http://biomisszio.hu/tmp/parisiwibaradumekena.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775091ee58f---xapefabupewonofeb.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/56546079635.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/42818737829.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ddt6dp9gil614a8t1mjd62rqmf/lewiliketufukosadem.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb4295557---titegujizidi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e8314ffd78f2e76fbd2f1c5e0035dd95/89146702256.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/seworiwodo.pdfIn PDF document text
    • https://marigabung.com/contents//files/73490638941.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210525042648.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/judemali.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/08b73e454dc505fd512a425d09b2c94b/jiniterevitawokajuxegoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scribblenauts+unmasked+a+dc+comics+adventure+download+portuguesPDF 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_off00019181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19181 11416 bytes
SHA-256: 631ef1d3d1cb9567fc27adb683e3b5b1a9f066cc077d568305b6448809651d95
font_01_sfnt_off0001ac02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC02 18116 bytes
SHA-256: ff3430380a3d5825157d90901af5329f2399393830f4ddc7fb590d7fd497e72e
font_02_sfnt_off0001dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1