Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78d75b5cfa77e08…

MALICIOUS

PDF

83.3 KB Created: 2021-08-19 01:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 267ee92e840e6e07370d2fa90d3e45d9 SHA-1: e162f00a29bbc295bc7ac1c84df3959a2cdc5e14 SHA-256: e78d75b5cfa77e087c2714dab8d0a9f45366ef3f513bed9b0d3d4fb9d3c96190
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=corporate+entrepreneurship+and+innovation+morris+pdf PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946fab0e861---vasidas.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fda4e74e3---58279593836.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/12675975524.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/nezewokarugegexifiv.pdfIn PDF document text
    • https://digireg.nu/upload/bosedalekovasejalo.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160701251063e3---morikuzoxokixod.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bimezabapif.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e901d2e979a---rukib.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0053226c---tevebadelulawiludezesod.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/lumop.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/ropoza.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/863ab45ac00c9f1be2b2adcd60c26e7f/50911762525.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/k53rgigi9avocdvgrkvc3gnjo1/lanawoge.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f42f358e3---95942168023.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/gogitubimoximopijomeg.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/julitamavo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/91563144307.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/tabuzew.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4ce6ad03---46172530057.pdfIn PDF document text
    • http://www.toptehnik.si/images/17793205198.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487e22da4---40551796695.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d51e40775---mefin.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106091411149791860fymdri3ujiw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608035ee326d4---25429175308.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/59713819420.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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10916 bytes
SHA-256: 99cc3de33878f73802bd0a63c180271560d8bb901e95cecdd965a6cafafde9a5
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 17456 bytes
SHA-256: b31bbadefb86e64d9e1255f793b4c76c96628e5406adb739063149bc5c08b62c