Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dde7598010f490…

MALICIOUS

PDF

83.8 KB Created: 2021-08-14 11:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2fe6dde61f77b3a7467caa6021dec4e SHA-1: c7e24093faaa9b48cc5d0b526cc92baeb56f6312 SHA-256: 21dde7598010f4908eddf37cf85074c49ba3aedf8e9087919d532392b9229695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=how+to+read+manual+scale PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928e22a84d1---30586946268.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/luget.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/73203008253.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/nafusosoditete.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sefavudamep.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7972638b7---sigomivisotu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/ripenagonudenudezilakol.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rli9822ov8aiimc6ivirl0sril/lozojomifililagesaboxuvug.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/89443da296c1f6512b23959d6233b2e5/bixumafufabedevew.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/wosusotubalu.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/peroxogijukir.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a989e2b4---xurexutapufegusob.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a55f617bbb42bfa1cc4fc912e1b64804/51953454383.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/rojijinapalaju.pdfIn PDF document text
    • https://dptech.vn/uploads/files/80630285671.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/lubir.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ea9a6c1f36334956d4725686b4206831/nopit.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/pogod.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7464b37e3---47135222795.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tcj50824if0pt28eqgup7rij5o/jaberuxutovamejejasafew.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/55870229752.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/27435830441.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/vufitovufigajiregivenok.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10616 bytes
SHA-256: 8414f76fd4fa0fb40dc967cb648d25c0817d7bf5ef0257a0943b92674a07908d
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16604 bytes
SHA-256: b99deb5b1fe4fb3b4eb66342a78043d5291234013091a1f2df8235baadb5d8e4