Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a1d07ee79ce47e…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 17:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 514096e942bc099577ea399d67409016 SHA-1: 7a346f5f09d6f854bd508809b442673727368924 SHA-256: 57a1d07ee79ce47e884a9b8ab133fbe1f913c0f056c6bab2b34f89b84885ede7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, so the primary attack vector appears to be the embedded URLs and document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://fertilizergranulatorprice.com/d/files/wigufululanok.pdf
    • http://zge-led.com/luodan/images/userfiles/file/56010233999.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bd136057bc2f89cba7fe9044b36d3d39/fusipuwijenepeved.pdf
    • https://bednidhitraders.com/userfiles/file/bujawitaro.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc461e470---dozusimogenenulezo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/894f0f7be323d77b63404d190b0406f0/tiketegusunapu.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/24897429732.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/35185564482.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3885c197e---tunagararekomubuwedotox.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7851e74387---31480399135.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f486f53507---davux.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e6a121f2f67fdc2e142c55412f9ae177/dutut.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa3a2acb5---kubebisevorinejinovefejeb.pdf
    • http://servis-hradec.cz/files/file/ruwav.pdf
    • https://anjingliar.com/contents//files/dumatototerumok.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60234ea0a---pasatojaw.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5603f234---2205311059.pdf
    • http://riskhedgetech.com/uploaded/file/6023377586097acbf2112a.pdf
    • http://onellenorzes.com/uploads/files/wujuzuzagipejavovog.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/43955553734.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5a1a9b1eb83002b9dc3b24e65b2f9bc7/49117717262.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32cf22cad23e5844b171bf81ab2b2831/73404011305.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2d5ee3b21915277d6ae44173ffeab721/60400067083.pdf
    • http://appartenvue.net/appart/upload/images/xodemibitidosesekidopojiw.pdf
    • http://martonelektro.hu/files/file/50806602643.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=images+to+pdf+file+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98a.bin
a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16076 bytes
font_01_sfnt_off0000eeac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes
font_02_sfnt_off000106be.bin
ba29e11486c195576338dfecd7811626169f484ce623686621fca9864ea33c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 17128 bytes
font_03_sfnt_off00013399.bin
17486b44211c8e349db2f1fcbc491846302e05a415fe33ce3f5c98dc920f5ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 10980 bytes