Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a4f7f87264e1d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d8fbaac2d1d8e4fd0a3269db1ea42f4 SHA-1: 90d938570fe6d038f5f79cede4bef637a00fe010 SHA-256: 9f8a4f7f87264e1d2103aa77a7cf3bb268304be4792ca3892b34c6cb69a66d34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=application+not+installed+android+fix PDF link annotation
    • http://gamax-motor.cz/data/dokumenty/fetoxitovupira.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/tepivekalomano.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/mawas.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zapugagazutesixobozaj.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vaxezasujubafegufino.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/96520446117.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e95654ad0---govuwimavobunazuwof.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-9/20210909170246545441.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/56962836176.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/79459624700.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/99026287594.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/74943988577.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/bipefisebaxa.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/diwanidanan.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/roruniv.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1a191b351fcc4a3a8454cf2c7a33e70/26709215060.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/buxikajub.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/5731254377.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/53741113738.pdfIn PDF document text
    • http://bptramptour.pl/files/file/44845948474.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/60583522308.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/wupanudamojivofiwasene.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e17134a0649f645d6a3580f6b82fe5e2/jarogufodal.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc8d095b31---18478561100.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/65435803997.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/20075870531.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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 14740 bytes
SHA-256: be82393af8796a8555b9c5be8543518eae7bc23fa318f6810389d2ad111d132b
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10696 bytes
SHA-256: 7cb9fd84a73a0af9215bf1c467fcd95baf6b3a69482c84f16023d4edd04d1b45
font_02_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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