Malicious PDF — malware analysis report

Static analysis result for SHA-256 149067da429cc652…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 17:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2cc50f84e3498d11f6a568c70142848b SHA-1: 43421c08f713b75418d05f839ef4f3e564a85597 SHA-256: 149067da429cc652728ed729d34f4f8bec4356f8b461c431c1c1d1a6e8aa421b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://autosklo.sk/pictures/file/35849226220.pdf In PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/50718185860.pdfIn PDF document text
    • https://upaspor.com/resimler/files/60498291989.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wazuxisin.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/zenozexi.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/23172962727.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/juxifajikaju.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/ximamumadogedemusumexose.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/felejuwitoxonuno.pdfIn PDF document text
    • http://marymo.ru/uploads/files/kumirizusefibokifek.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/70904702819.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/44118959731.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/simugeburuzu.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/34771440889.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210905161505.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_004728.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e99db46df---davarexotezosa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/26aud9ekce9hij7crepnd8mlj0/53881820578.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333ad37eb1e---93941676311.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/79149951841.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/91951256775.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/dasejotogixerajane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=laravel+get+envPDF 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 9924 bytes
SHA-256: 005ccc084dff4a18c4362b9c77c586040fb8c32361d3ecf64d50934050441576
font_01_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 16496 bytes
SHA-256: bacc8d5269b76e877df434106ccc059d6805a70b0c99d69dff920e5d42f9212b
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1