Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f10c393dde058d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 01:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e89034efba0755d8b580bf875ba21da SHA-1: 510e5cf4262a01fc6d55edc4dfb8f3efc48a624d SHA-256: a9f10c393dde058d38d0a1f2af8a0897a337af665ac85d3a82774aa1866958f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+turn+phone+into+pc PDF link annotation
    • https://hexema.com/FCKeditor/file/zaxebiwubafaga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04cd9a7de---siwixiwavamikasomo.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/67733954177.pdfIn PDF document text
    • http://cpils.com/userfiles/file/wiponuzidevuwotusiwob.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/34618916910.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/36766041831.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bonajumisaxatu.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/81560650799.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/88872639937.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/faxuleremajujosomewat.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/kupolotewa.pdfIn PDF document text
    • https://fasaac.org/temp/files/tixekunerotoseziboma.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pedinetixamewizitaboni.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/misegu.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/gizasaroxiguruxakatefegox.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/26298901046.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6ed0e3372c33a60953ea22a98311df6f/1195501102.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2721393688.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6dfbf1fa0e5b09110afa29434bb1a438/32960752927.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/18471741664.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61417225570.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 17764 bytes
SHA-256: a298be4b051a916f7c29543dcb93df5c71894a73010ffe78f9ee6a20ecbca809
font_01_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 10272 bytes
SHA-256: 50f7b7fa650786acbbf73a92be76ed4d84a6eb811e8115a4db81538b7d30c66d
font_02_sfnt_off0001332c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1