Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f84f851fb1d487…

MALICIOUS

PDF

96.7 KB Created: 2021-07-27 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfb32eed78ef0ec6f45020660fb8b609 SHA-1: bdd33715af9da1b154cae787180dc7b22d30d402 SHA-256: 19f84f851fb1d4874ec8f5e2bee73fb0565a475286991759cf1e6e5b408ea62a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b4c9aaabd90c1f314b15c29079bd47df/84278300661.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4caebd6b2b18b3eb951bc96c89ed64cf/49006457052.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5453fd7b11dd71ce04e4363ecd3a8591/tagomuwoto.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b26bd7a0ff9---nulozegowijamipitewavonib.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/voxebox.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sadarewonokelul.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa71a39f5---fidika.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/61322106358.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/79400528510.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9189d593f5---posatunekifitawufazosefer.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19836b47b4---gazozi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5053f24f077488ab26f9fc685726af9b/21837225593.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kfglfj0pkop3jfc9bph4eubpd0/mixenul.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_61E2523A90A8BE4A.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ecb108bb40f8e47e4f6370efdc9d48c5/nikutobisu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bebb95467---dodelemesutuleni.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e548b464a7---97200026027.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/maxot.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jp5cjh9pne2qe9l4gblbm7i3n9/26427790093.pdfIn PDF document text
    • https://cmoretv.com/userfiles/11491262110.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15865a0eb5.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/92701361570.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dbce1rum68all766chc2fv55rk/zejureweli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+to+peace+keepers+world+spyroPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10776 bytes
SHA-256: b57698d3ad69ce7819b0e407384efcc7f65b8169d308756f26edbee10c5999d5
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 19324 bytes
SHA-256: 1fba319964cc06d59034380065f800d6520fed85b8a210a17b7b2cc92359e036
font_02_sfnt_off0001505e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001686b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686B 3044 bytes
SHA-256: c86fd649002a7a8ad6f473e86cee046d6be3a892f584480955785f1dacc69344