Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa174b95d3a51f8…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 11:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0e8352d92cc6fc120b033f9a64ca4bb SHA-1: 19106d516f02df28690ccb63467318d911e903c4 SHA-256: faa174b95d3a51f894d38a5d9ab9996e8c0cd853a071c0f6b4f7419b62039295
164 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a file. The presence of multiple unknown URLs and the 'compromised CMS upload link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a45c30524---wizizobim.pdf In PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51650038360.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/113f1c9478d5764cea0d4ba3fa808ce4/78880853944.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fupijomaworufomebulu.pdfIn PDF document text
    • https://emmaushuis.org/pages/mudulowagivek.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xabukipawetewexex.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1a623de2c4f55c634be6224e3bafb85b/bolitexonedimedezuf.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/5002606528.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb43e6333d---vokuxixoxu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acebc9fa1---pobutujanapukepetetaforaj.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f86274e7---85879868517.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pavaxejomabidu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B1E6034B8C4.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e293bd2d9f---xaxuvijesivij.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9deabf1b6d---31470737807.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/borikewipuxav.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ba20e7b1---xeruraradesuxomabenevumi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/370f97d1d8b194ef8554b1aec4854a1f/lekigogatizorow.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/sixapujigojikolazo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/411f23dda04a77e59012ca12b3de42e3/76776193748.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/68424007526.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf47c4959a---43657503480.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/xonujudujiminupojodedoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unruptured+follicle+syndrome+treatmentPDF 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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 11000 bytes
SHA-256: 9f0e4f6de7ef1a6baab019f2edcc4b5b64d8da5c7d48e72c6fb5e5939141859c
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 19084 bytes
SHA-256: 0af1e31f8ad6409a66ee9b79a9d3350cf453a0b2e490f6b0491615c67f08dd16

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