Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff15b410305a07c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 23:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 979ebd478d6f727d203e7f04b892a934 SHA-1: 6e72c92e6754ccfcc63b5f50360d6a3b6453584c SHA-256: 7ff15b410305a07c771e5cea896027575e9bfbcb4aa3d029e27e485d70d4539c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The structure and numerous external links are characteristic of a campaign aiming to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=multiple+files+into+pdf+online PDF link annotation
    • http://ibookingkr.com/FileData/ckfinder/files/20210705_96452C1A990027F6.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea4069fdd5---digijilelosedolowup.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/67073351453.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dijaroduniwosikitutipak.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/34969148696.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/pexubugogironasexuxeburev.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62039090377.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/11217139420.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cac73c87b568ca2cc1dfc90af8d3f144/dowixamepedubekukeruxoka.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49340595808.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8be38c4085f8e32559d52c89e4a22ddf/wuzawid.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/57ba8ff56f809eda8e6d3f178ef69624/47436066642.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4d473932---gimatikob.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/71048279999.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/6927257403.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/wutojetekurixipik.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/fubesik.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160843eb92efcd---welufujenitukuwugakoxi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/67296815643.pdfIn PDF document text
    • https://goldenapp.net/file/donixemudurifuvasazovapoj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/759d83369d786854fe1ef56af03a41e7/87527616399.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/90675725593.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kaferemefosewakarotegop.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/80008523328.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0840dd4b---toduzazal.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 17128 bytes
SHA-256: 085b1d55948eed26a5a9501edad42667f2cb67ed7aefab14dbcef56cc73f346d
font_01_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10324 bytes
SHA-256: b11944c22be8a692f3ff4ff38490b56e783040f46b951b29b0c5199a39a847ef
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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