Malicious PDF — malware analysis report

Static analysis result for SHA-256 9175ad9002e06590…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 03:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a3433f414694243ca17c382860de23d SHA-1: b7085dc4cfee498f4dbc699485be1330555652fc SHA-256: 9175ad9002e065909af96c2ae5b76962206db123c2375d89022ee85c666b6cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://synerhu.ru/uplcv?utm_term=sistema+nervioso+central+anatomia+y+fisiologia+pdf', appears to be a lure for academic content, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=sistema+nervioso+central+anatomia+y+fisiologia+pdf PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ef0e0cf5f4f75cd303a43d11f0777b5a/banapomadixosibaronu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/setuzalizagi.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/64433193668.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vajukidudaxu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/fe22a8e8db84aaf2bf18f7616816f111/52799075549.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/lajozezujosawimi.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/83868373968.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hkel1cj2598o6dfgqfbq1eucl0/74458699382.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18538555c---wigipuxazasofemigubaloxe.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/bipotosezurejutogogodija.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/209468bef76852fc4a1b3cd9f6556fb5/62939959746.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b802fef4d16568e8a46833bd4392de43/20710645816.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gevajeles.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f43f1cfb3---rametidotaponuris.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e73607071---kapujubizel.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5rf71iv68iek1lp8lcghm33qb8/39406623007.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/21/19669468317.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/xowomawo.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/42869962733.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/neruwodidadalela.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d864650379---kuxezivesajama.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16884 bytes
SHA-256: 208854a9e6c6ad7733dc13e070b3c054d1921e655c9fc88af30586a7d0c64209
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 11220 bytes
SHA-256: b1f3217f9a30600ba3ec7c781d430fb9dfcfae1a34694575f5a004b0073ba1c0
font_02_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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