Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4600b02706ef16…

MALICIOUS

PDF

94.3 KB Created: 2021-07-07 01:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29ed682d79de1c9b4cd9c8099a06026d SHA-1: 447ecb31b7fbb6c0d488147f5caaa44b5be45464 SHA-256: 1f4600b02706ef16ced105ecdd56aa818cf075608c8de2aa5187d2f2a00b7c50
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/54c1922fdafd63a14ee6eb42be05b615/xemotoxuduwuxesokesasir.pdf In PDF document text
    • http://dhf-china.com/d/files/33160859978.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/zigeberisitegupowedopobof.pdfIn PDF document text
    • http://rld-carbon.ru/file/50653956012.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782db3df422---raruruzor.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/77688875571.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ik51o7h0mgfuf7cq21au6pl1j1/xedomujazebipenezujobawir.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf990fc7cb4---95786153302.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4bbce1462f027096cd2326899468a81f/65557212695.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/552582708.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/disunijezipiritom.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6bmmn98iijdqna456cat4061h2/bedadijenujunivubipaso.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/kuwag.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/063f0093ada27d6809d82aa1a4dc33bc/vobozagux.pdfIn PDF document text
    • http://email-database.info/userfiles/file/zowep.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cac97b25506---mazujoj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a776da474cd---roroxuk.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9171698a1b2952adc8b0aad618cf563a/28209091191.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5l3ks2hadv5imp8ms3jhbt8ei9/vusonezunixalisep.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/fupevubisuwoze.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/773c325177cfa84cead704dbc593ffde/bamubixowivanepokox.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/piroxe.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/76920071237.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/kexadanasetowafetamut.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/44f63j990o7vjhkjhc8a2n0938/9586992399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=silver+fang+legend+weedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 16752 bytes
SHA-256: bc41232fc708a36737a47d11a0df7da9cd2b1311d2d858f8fe5e946cd9bd7374
font_01_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 7616 bytes
SHA-256: f070cc9fdf66b26e402cc4d3b1b2f8553ed0759d5b68026d5623b14c4c8aa06f
font_03_sfnt_off00015242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15242 10372 bytes
SHA-256: 7ead3e15544d94628ebd1b8ff28ad5081f1bb59e8c0592e0b93d0fb8665777ab

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