Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f382530f02b353…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 03:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47a01e47f9d36e9f0b2e28cc4e9572b4 SHA-1: 0d36d8b8d99e6b190870933b3e48335df2f9fc3d SHA-256: 51f382530f02b3536ff9cab1c09def5340539638e6c4c0990ca2d40180b28da1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to trick them into downloading further malware. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b585a8dcf---89875342867.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/030519456943.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4309820ef494f5b4d8fc315f55ff4624/11957485545.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/arj6g496tlilrm8tviu2fjaq84/pexijefawufadikovepivanav.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83412e2a65---81155649070.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tujeporuvalene.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93c02fc2c---72304734622.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/820308192.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/malivupo.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/56052426339.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/xelakojage.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/jidudapiwasize.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964891a67a2---funafodelujifusiwovogenek.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7be1d57d10---47960721127.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/52217192105.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf13d5599---95325935703.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/99370664511.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3e82487fb20653e105185e6bb9b478d0/ramulifudewebiwa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1debcd85df---jojobiwivofoguloridedam.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6feb7b74a166e74558efdd891927aa5d/xadutobapapivetovawomago.pdfIn PDF document text
    • http://qca.ch/userfiles/file/84860714998.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/lusibifajoruzumis.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jinedudozebajat.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/midevefugumerituwimar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+software+free+download+for+windows+8PDF 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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 16216 bytes
SHA-256: 9d49a8f9cdb052e18999365ad64a636bef4c697aea242f634731929f2a30acab
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 10644 bytes
SHA-256: 8841a810b24a7dcf63d4647029abab174e5ac97876a00a1b52864b5539dc2f6f

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