Malicious PDF — malware analysis report

Static analysis result for SHA-256 838be6731d9cdc0a…

MALICIOUS

PDF

91.1 KB Created: 2021-07-20 09:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 570600e4fcce29328fab8738055a4822 SHA-1: 8812575537a5759e79eec5b844b605b4faa122b4 SHA-256: 838be6731d9cdc0a23b99d7fc8af331f502e3cf03520ee39a83f9c32ac835c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9347b66539---58636548865.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f79f18a3---467746222.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aea498d59b3---77956824576.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/29620601500.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/89915522657.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/pk534onpmei87mb90bvi4vr62i/15442604570.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37294241d7---46487094929.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/vudasijimikapo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/72001249933.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ouu5v83m2n7as33uo3hi1j46r4/memamesomawukuxe.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/68509847451.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/46108002632.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/56522090338.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d10fdef28---vedivogekikuzigaxi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1b0ccae2e2a307189027cb198eeca404/66648153433.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a6d37b84d3c1fb85ade879ae4a58c348/mulakizixegiwatujo.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/77938094207.pdfIn PDF document text
    • https://businesslife.com/content/file/99490792361.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24951812121.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/202739fbedc73cd3b0eb58e24c4dd5cd/37116529229.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/9984183980.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ac110bc10a9e749607a6b942c5c8058a/zekagadopododup.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/82299964657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=real+existing+socialismPDF 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_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 10620 bytes
SHA-256: 0aaeac5a49e66e9755594d6a3203b53de26ccddc3e2a0d897af076da241cfeac
font_02_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 17432 bytes
SHA-256: 82838432b57ae7bdb759e06ff1a5ae28845b5cfcc28e1b96b80e92a8d90d6ee5

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