Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf616c070934153…

MALICIOUS

PDF

101.3 KB Created: 2021-06-30 08:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 260b85fc195469ab6b013963da5023c5 SHA-1: 87f3d7fc7233bd0d4a4869992aa9869e0d5ac38a SHA-256: daf616c07093415377f69dd8d4a4f0f42249030a1d5214b48e40cc192530e76e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58ccdad84---14949975792.pdf In PDF document text
    • http://www.euro-fly.eu/userfiles/files/38361030756.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/58278325029.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/pevuf.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/saxokunuzez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/34233769611.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/39389540845.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/51937059442.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5cc9a67f---13153347622.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078acd000159---87188330886.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48233d181d---dapezib.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096def13cc88---tipamuluxasamomupagejanu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/famego.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/gurujuleregujo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/metutifu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rmf8po64buqmko390fi3citki4/8987062796.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/85904740996.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/86rlhkth5279kov5j62821eop7/mobopaj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609672577bbfc---49152962365.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68b310e15---62676184580.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d7701f5d578fda46daea49aece63c34e/kaxaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=definition+for+dependentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016630.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16630 19544 bytes
SHA-256: 2f65482d39b481e5313871cfba9c7eeff7a677f5df8b2bdd6cc2d1d583dffa53
font_00_sfnt_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 4652 bytes
SHA-256: a751fc73f80a1ce4abe2925c157adf815f4ca7205902a8d2a2766fecfa65fdac
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10116 bytes
SHA-256: 923ad12eebeacdf1f16e832525b2e10b41af402eddb78db83ca14be4d22797d1
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 26224 bytes
SHA-256: 76121fbad71460100d58cf58fe02576415b10954d9f18d35045f938898090697

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