Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ab5b2d37e22eaf…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 05:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07173d7208b6b36b03518dc40d13de56 SHA-1: e5bf5f12fcf4e2fc2600c28e45e896e40d92ecb4 SHA-256: 37ab5b2d37e22eaf4a4c467fda2b075cb3c870774df9decbf8358e6c5b5fdc2b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

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 https://ketchas.ru/uplcv?utm_term=the+great+american+songbook+foundation PDF link annotation
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/remesakeki.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a800d51452fe3549cf99384cbac1e1ea/21013785099.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/32465178571.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/32875970320.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/18835478272.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/72057579174.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/bemunorimedukuweva.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/numarigakufenemapim.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/rojaraxokal.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/tasuzamixidulixobaxogi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/lanesibafetug.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/lujegorug.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jutawokilurivovevajena.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/851314e3fc4b22676250dcec43c22871/lazil.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tetipoliponunoluzarazariv.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/takegomigita.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vadebeduvozederosutu.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/24086988458.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/53878950622.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/dbcb04d7efefd454dd8575e069d77bdf/97778220413.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/jedijedanigaru.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146b8ab6113d---32094379224.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/41012700342.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/gagifixinubakitejugig.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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 11172 bytes
SHA-256: 47f860069d95059e8d7efa8380242c83f27efc71c71f10401a7b46e288f5e412
font_01_sfnt_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16184 bytes
SHA-256: 93fd1ae9c11efd6a01a48266550f378378f741ceb656d40c7e45646c480e7e05
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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