Malicious PDF — malware analysis report

Static analysis result for SHA-256 b357c4c8e2b8ad68…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 19:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 504044b924ea0246ade2f6d83ecc865a SHA-1: 6510e3967711a689262e4ec14fbcfe4616732325 SHA-256: b357c4c8e2b8ad68c0a4baac1c603632a7c5fa5490d42bb644c6a6a817aa612e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including those associated with compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=two+differences+between+data+and+information PDF link annotation
    • http://maihome.hu/admin1/file/76814942088.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3d7c351b0cbc68b806a56cfeb098de2b/lunojedebixuwigoburugasa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/780b6a199b95aa942701b6180cde6f1e/zoviparobofelujuliwufewo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jomasedowujujebalig.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/sisurexivavufulelixinijad.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bn5oghbggggc8trh38rtmra4f1/78616660374.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/20/file/20210520_202231_117.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608251a8b54e9---86156752987.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7a9e33fb---25275136887.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vaxiza.pdfIn PDF document text
    • http://heizler.hu/files/file/rozafoziboguvogugon.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/53711917441.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/47866454502.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f11c1af93---24594906898.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3894240c7856130fb5a94a0c834bb651/kafixaxuwara.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/37021463077.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/54799878291.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/49af2adb8d5ff6bc91bd505f943ad437/dudazisuzovubasaladelij.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/kasokivikibijuj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t94ucga5p215gkjpjjbvvncrk7/53907629878.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd158376d7---mofedirujanexufif.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49073189629.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2787f831a491780cc3e621ae1eecffae/tumani.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/rujulazafesabot.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kuminobetewejofezode.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_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 17216 bytes
SHA-256: dd74a306e30c0afd0a325687bc0541e147c27746c01cc75eaefd5605f4e344c5
font_01_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 10780 bytes
SHA-256: d0f9f1eb8167e9d5bdf4e7e71afc9420c4d1addd79acea6406c18b0d0e92dc57
font_02_sfnt_off00013f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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