Malicious PDF — malware analysis report

Static analysis result for SHA-256 343727a52cb3f390…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 09:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d6fa8ab7c9cf9d4505c2728e8e7e2e1 SHA-1: 5ed1f5ae204be61858da0d00fc0d66bd7ab5bcf3 SHA-256: 343727a52cb3f390d68daeecd1caf8e9c01fb2b8b8d5d2dc218e8e3f40c33d8e
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 CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=idle+heroes+all+working+codes PDF link annotation
    • http://studiomarcheluzzo.it/userfiles/files/45879425097.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfbbed46c5---xasivawukofosipinok.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/5959435375.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vuxefozamabutuvo.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/dusixojewoxebasaxaporot.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/91091548284.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b942c8aa715613945b4a086cc153aa/sidizofifisuxodasen.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3db474d727c05b13c5405384fd798973/podazalipikaxomusijox.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/40396214812.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8766fad9f3a55f20326fcd93ca36431d/jovidukofasitoje.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae9f02290---21202402549.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a242680fc---34192990665.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82d542bb2f---860332858.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609289b533214---geviteveset.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/wixamuzuginizibikora.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/64221607523.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0405f5ca46---70615876116.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/16278020162.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pizirukoviwip.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/48c36717dea6eb914b1587bf645170d9/36514346688.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/sagolinamapoludipajov.pdfIn PDF document text
    • https://proxus.nl/file/29618005019.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/22288195971.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/levebabewozikiwawiluri.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4r1sv4n1ds1de22r8hjds80g41/luronagi.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://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_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 10680 bytes
SHA-256: 5eabe28ed64c4e2c5f23fc90eeac9b8f7faf6994bad27a6ab20ad056d47fb626
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 17864 bytes
SHA-256: 9c4b1a9adfccce3fa87161383666b7d84eebe05921eb789c81da8526655558b3
font_02_sfnt_off000128b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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