Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b86e845559e1fb…

MALICIOUS

PDF

102.7 KB Created: 2021-07-19 15:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f18071ed728208a808399e88958bce9a SHA-1: ebf64fa1e9901b98be9c67267cd550eaedd49b10 SHA-256: e5b86e845559e1fb44c16b39008a2254978bb033f92a4aa28d9a0acc02139196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the compromised hosting suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5ec0bb2d---vivojaf.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a88a9520be16cb10bd66141284c1972/tikobatixemesadab.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/064884b0ef060c37d74625f02e426732/menozagoxijogutemoj.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef38769b1d---10385816705.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083daf535ef1---pitotuwovozidudije.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/150d5814883b8ec0b8179d894c773eb8/verekiduvagelebe.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d705b4f77---5656043462.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912e257f0c---soxapizufopidegolugipasa.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4239a888b0---dolufoxogapajipazisexu.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tuwoxovovoxip.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/kogebararu.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/72465547455.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/nunewopitajibibofawevubep.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f16001a3105db4a2be63292eab489122/41340847636.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/bepifuzogumolitosafo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ade84693e---neroji.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5b0v0rnhkondp0l3p727aftv42/xitebebudu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89d2ccb1d4---39302645938.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/25fbd98365bb8d068f46d3f6201c1588/sutedelalitikorimalil.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wosevelarijamisexarej.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a938a4c96be53af9fa05a6dfb068e6ac/wujatasilikisugizeporo.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772f223554f---33237364759.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ece4a9cfe---8337600006.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a2dbab7c---wodukojoteluresifurese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=15.2+energy+conversion+and+conservation+answersPDF 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_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 19880 bytes
SHA-256: 45d4f3a539c03332b4699e28483256020d4963af72c300e9d249e7bcd1cee246
font_01_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D97 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off000172c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C4 11040 bytes
SHA-256: a7b047698b52e4f9ea7aa59612daeeb5adff9868acd060343179c55fd5e6e8d1

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