Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0710c028879fde…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 18:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 664117925ab38dd180dd63606e5e04ee SHA-1: 9669cb44723924aafa78f0dbf23365930a44d36f SHA-256: 1b0710c028879fdedde20207cadd2c95069b9b3632885cb1fb869a93f5254b28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised websites and disposable domains. These links are likely used to lure victims into phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=saxon+math+intermediate+5+adaptations+pdf PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1c7978ac18d06670406d6bd486ce6bc0/43248851980.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/710837e4703f0ff088b288722ff8c165/wesuvonotuxelalidojenewon.pdfIn PDF document text
    • https://master-service.ro/images/file/74103075342.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/36052610740.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bac0a2bc78---58859530905.pdfIn PDF document text
    • http://vhshf.de/File/53758356377.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/61907913854.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rapipidezeku.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xoxunamagipafopimesejudev.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/wajafaraxexejopafome.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/22502148054.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07dd93ca7---39918395168.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73338508261.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/vibasetomepurozipub.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907032040.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/gipobotikasa.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bdd0b9404---nesobemotiperesitig.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/fonov.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/xokujugerexitov.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8d58dae3---36903468183.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hjvfjgv8ks8buqceu3sbgh54g3/97350797902.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/43852233622.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1a5bbc38---jawano.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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 17076 bytes
SHA-256: 16cf55d118af9e83ea1e0715c15c253c68a57680348e8e475d0a731369999f24
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 11028 bytes
SHA-256: 308683ed3b435f161210895a0cc781bd80eea5a4fa1be6a8f38409ce9cbe857c

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