Malicious PDF — malware analysis report

Static analysis result for SHA-256 a347a7b393a1b4e1…

MALICIOUS

PDF

93.4 KB Created: 2021-08-01 17:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9f54059c75be4a3e24ef43bb8b281ed SHA-1: ea6d50583d1183381e442de39fb06b866363b211 SHA-256: a347a7b393a1b4e147c78863b933adbc12a9a8f4fad8d85ac165e4e9fb539e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=serial+number+adobe+premiere+pro+cs6+mac PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcda7854c9---78446347654.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f107a0e77---waludogejerozolipoxu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c49ad1f8---28741737335.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/49845330211.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/sewozudanotaz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9be1cb87---jenaredanuzeputeserur.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/44id6a4phhl8jvub7vmdaughqm/27969541137.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/49b3h2o817d53u9i5i9g2js2jb/88018536868.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/dagogaromapuzixe.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/31067651205.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e5e32818---33458483055.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/lekegogeledalaxebotiv.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/66850053892.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/19865911422.pdfIn PDF document text
    • https://ptogel2.com/contents//files/87113035437.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gapijogetesenokuzisedat.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf50ccf5d---25946148787.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ihvpl63q00fv6fj52nm03gbpvs/29735905536.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210726_042808.pdfIn PDF document text
    • http://yongqingtech.com/d/files/dekagibujetakon.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de09af78f---24043472162.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/ded9db23049f1d4dffbc1ef408a46c42/38122656365.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_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 11060 bytes
SHA-256: dcf0a4e4ac61db56f7bcfb8eb37586b9d5ec462c9eee71b1baf001410a5a0213
font_01_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 18364 bytes
SHA-256: 009dd7d4a421d65274268d79e025cbe40a2779392f31be6cd73fde3c5e46745a

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