Malicious PDF — malware analysis report

Static analysis result for SHA-256 1946089583ec0c79…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 00:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 715bc3756177d58d319b085f80acc348 SHA-1: 0a2b9a269d373fd951cdc1406657e7652bca68a8 SHA-256: 1946089583ec0c7951b25ca15e277b05dcfa797f60cd3d85ccaa5b5a940e8321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a malicious document designed to exploit users through external web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=android+webview+inject+javascript PDF link annotation
    • http://vividconcept.in/userfiles/file/11023722508.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa5f1bc33---96087006379.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/24bb04ec8a340ef27eb0f7f34d63241f/wagugugoxemibodivobal.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/625651387.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/46608236198.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xowalixopevekilusel.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/5896576277.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/mikutidizuv.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8d18f133---dalabulakosozitid.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/zofup.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3d797f35---11497526663.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/jabobixut.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/52842926936.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/23951623012.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/39646293517.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908110059351719.pdfIn PDF document text
    • http://gro-felix.si/uploads/70798824636.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/22619394118.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/61837360741.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pisilujifusis.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/39128912934.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/safuzanitonejugexabadexif.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_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 18628 bytes
SHA-256: 045d9cfab090da457e1e4ee82bf997f94416a771c516ad17f1cde8e428c81e76
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10864 bytes
SHA-256: 07617586fbdbadc3d6c35008744d5fb8ad9280dd0d50412e325996501c3726d8
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1