Malicious PDF — malware analysis report

Static analysis result for SHA-256 5509d9013adca993…

MALICIOUS

PDF

114.0 KB Created: 2021-07-03 01:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12e404a27985c44150ce573430f52684 SHA-1: 2b97666c1497f6f4181929ab4c98bb883f045e3e SHA-256: 5509d9013adca9939eee6b1c47b727f3e13db79fc25ba297e4a6655a63150b15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mclud9acu17p6tq46rm3625jsb/tazenijupamomedubem.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9877daf8---54025690801.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/jitifebixow.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/83356312144.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/denizubefo.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/juvufojutugubil.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/da80b0de681d423cbd4b70c7da360141/26768797164.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gabuzuwinujaderijupov.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2d838fdd---50476769511.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/zisawoxifiganufudij.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/xepolala.pdfIn PDF document text
    • http://promador.pl/userfiles/file/dewuba.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14530bd34---74462791122.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60c6449e55d2b.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090be1cdb2ab---9871803864.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ehheejmt6gi8c556o1ccpsnb92/kuvawafaravilopiseligo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4380f003---puvunasaxaguzip.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/5937c8e529c59a825d76851908f2aa90/gusojukalifexena.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/c38585311042ae4f417ce8ad2fc89895/duvenesanawebax.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72016489175.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b1a5860c---zejatufepuvusoguxivo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/32520249253.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/7607924737.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff1f95a16---mekuxegofejewusimajaganov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lego+city+undercover+tips+and+tricksPDF 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_off00015807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15807 10972 bytes
SHA-256: 9b69c9245f2834cf11c23c630c7f296d91d629d3ffb0eedc54eedb08519005ec
font_01_sfnt_off00017179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001898b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898B 18776 bytes
SHA-256: a0747586edba7df5835c3f20c220ecfa7287d0e3cb5bcf0fbccd9b9d89202305