Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd32dca2d469664…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 03:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a47423ebb1dfa3b3c61c9e9188642825 SHA-1: 0e049b75e730e9fcac5df30119f15ec1b10430bf SHA-256: efd32dca2d469664a9c8cebdb585f2a9e5e2ae9e7e6f97a50c94aa8b0aee1e71
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware sites. The primary attack pattern involves luring users through malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lustigersteirer.at/userfiles/file/velulotakelasido.pdf In PDF document text
    • http://artdental.hu/editor_up/gumekuzu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6206015d---80503821326.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bamidugobotefelet.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/53728195699.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/70693417293.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200135e7b3---jilasipedatufanudapo.pdfIn PDF document text
    • http://spbi.cz/res/file/xukimofote.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/60367234524.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/dipuxamaka.pdfIn PDF document text
    • http://ceroki.com/image/files/89799285001.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/45596280318.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/kopuvuzafotisufut.pdfIn PDF document text
    • http://rs-entp.com/upload/file/96109121405.pdfIn PDF document text
    • http://findacommodity.com/upload/file/86544337265.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/jodetafukag.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614361edbc8af---rideriwirizutamolo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fesajewu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/51171620972.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/79556630953.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/91289323070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=non+salvare+foto+whatsapp+androidPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10724 bytes
SHA-256: 1d19b1371e228707d8708011adfe001415e9d78cb92011c08ecb55e40449f04d
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 18184 bytes
SHA-256: 3f3f50e709bd4a4895e99cd57feb74a16d2a2a4abce8912462c29f3168241022
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1