Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94dd74905632387…

MALICIOUS

PDF

94.1 KB Created: 2021-06-27 17:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65d63e2c964f58ff52e00db51f48864c SHA-1: cc6d70760c741ce25ac89a83600ec05552e1f968 SHA-256: c94dd7490563238749fd57c9941df132b86a08291e677b03c4573fb0fa66daed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://garglob.ru/uplcv?utm_term=best+smoothies+to+make+at+home PDF link annotation
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7295d6a948eb0ddf88f2da8ebb319130/wapuk.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30b894d04---ninijebedofoxadoroboramaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bdabbac67d27840834c7b0c8d0a1cd47/34227598700.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zonelitebunu.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/49835459469.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/ketajukuvokisazut.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785623c245a---50724996828.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e27d9b617eceb348d3ae50bc9ee4c68/mawugupipodesupajufesos.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94fbc95da---lewag.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/km5bu9sm2563h8o957h08ao1p2/guzirikugotevuv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/72vjpmt9io2icjrhhlmab5mr10/wemedapopuda.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee4b58cb---midefofuzifolow.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/xosofegoxefifufenaru.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/38677685243.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965afb482c8---kovesutobanibokeniwekenep.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9addea1a599675a03b88585952fcf80d/matidefezagazusopopuniwet.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a82a232---gukukufulupokav.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bulojorumiwopafuvudas.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/57922232972.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/56046274648.pdfIn PDF document text
    • http://nature-revive.org/files/file/bagazezabus.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/47fa4f12434766f76ecf723ae815e100/tadelul.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9e14b96f84b6897b6fb8d53acbfc0a1e/kulen.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/marexijitina.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_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 10268 bytes
SHA-256: 11bba5b1a07f776bcec1d0836381a1b9a3bdf2b3b49bbdc8e5af118055ea38a8
font_01_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE4 16980 bytes
SHA-256: 5ca3261361d0529b63b68e3f08d1117aee7b7ad52b189dd89a16574cceed4bf7

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