Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf58c53d9d4fdce1…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9ff6fe49dbf7e9028ac8f7ff95e63bb SHA-1: 39a2a35a3dd9998b1c544f09974d0cb417eb2a83 SHA-256: bf58c53d9d4fdce18363ce10e21a82bdf8b9f33696f43abf67832c6cabbbf2e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit user interaction to navigate to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://accuratesearch.com/userfiles/file/xotekezowime.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d333248890---17591366914.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f36d9ab6c---dolemisawom.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/zosoxatobutor.pdf
    • https://globportal.com/upload/userfiles/files/74449911806.pdf
    • http://davcpundri.com/css/file/9435538387.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7545c8d290---wijagetexag.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f3u7vfma0eg4c2810i20lsqbi7/dilomebujibivosewera.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad4a67e5---54709367011.pdf
    • http://caf-ljubljana.si/docs/vibewuvuzeb.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e8e7717645d359d8c90f7f0c3d6fd4f6/buretilosubokolavu.pdf
    • https://atlastoursntravels.com/userfiles/file/nejaguwijisifejolab.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gojop46idnaqkmhgv4diskdk8n/19872712785.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b732534e144---koveb.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160811b86993ae---viruwoputozukaxovimirewek.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/bewogisemepesi.pdf
    • https://eseninternational.com/uploads/files/80038905907.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba282b25fbf---nutasilasulabokomawusali.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m7m63b9l17m8aoefnr35g4mr62/jixokoraro.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aad22c80566148bb2ed3a923390d2c76/noxumodesuxuz.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982b8aa7f73---86206374551.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/30266678521.pdf
    • http://zafirkort.com/uploads/files/sevakabimawuzedugubeka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=good+communication+skills+and+motivation+techniques
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 16792 bytes
font_01_sfnt_off00010ad3.bin
ab63b88cffdaa7cbb70293a2049aac6129f164f227aec95a87ce7530ffdd49d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 17344 bytes
font_02_sfnt_off000136d5.bin
1e4cb106c5d4ad623735644fdea433f285ab6d5fe96e0ffb2cd21c919406090c
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 10976 bytes