Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a8f84c2afbabd0…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 19:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bed3065e4d553c0020c8dd2fc223a738 SHA-1: d75ffede7d6f29aa7589edaad602fb6b865b6925 SHA-256: f0a8f84c2afbabd0a82a4df13bf066260ac9f883140b68f952b074c6fe91d5b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

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://crysiq.ru/uplcv?utm_term=discovering+happiness+pdf PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360a6f20e4---43881774098.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/tikukizowadijenope.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa4aafe7e---11685305554.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa956b31490d03d67d4e2f13a0777169/gegulodinazojefiv.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/4623208696.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/60806874390.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/nafalafitof.pdfIn PDF document text
    • https://noddy.nu/images/file/muzawivodawimasekareboxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260fe449e5---15874313453.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zopofegebavetemese.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/17735137672.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0c2e67d5---vikuvene.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/22045363324.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5d81b3e0153e7d1530ac9635cffabe72/16245614593.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/56958890471.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804647c1939---74807664402.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ptq54g5c05mvpav10vh8pdmpcb/73476303563.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/taresaji.pdfIn PDF document text
    • http://industrialdevices.in/uploads/23221885480.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/22434966483.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883b151c944---vunanobisozojijuj.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7884fcd2---9358375403.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/ginurudunewekikufib.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079aae6e74db---kisofopepuwuzi.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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 17688 bytes
SHA-256: d4511da30ca65d4c6cd34de6655e8368cdc679ea45e151913962292cddb37072
font_01_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 10820 bytes
SHA-256: a9c8c014a31abf10a6aea159319b3f7dcc8bf25982342ca8d1bd72349cb2b567
font_02_sfnt_off000140c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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