Malicious PDF — malware analysis report

Static analysis result for SHA-256 c247b3a561e64819…

MALICIOUS

PDF

92.9 KB Created: 2021-08-13 14:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 088570c5c68816e2436da716506d2d60 SHA-1: 25da0700db0c033377a7147629f5d0d4b31a15f8 SHA-256: c247b3a561e6481998ae8511bc3b71984ad04278cae3415f10c3093540082d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses deceptive language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=how+to+update+fetch+rewards+app PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/93bf44b785171c0adbab50be706bed43/baluridinadalilesetatid.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/23n7e42r781uamjets0s5dr5cr/wuwivaremerutevewixomobol.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/3519508973.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gukojadikufituparos.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/nuxizororu.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/ruzewej.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cfe6748a954ab562aab4290de0fb874a/zonokibodifite.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071996dc02ad---segemekedezu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1bed957bc---26377345307.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/36397145089.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/97188822584.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/gikugezakizatimakejulesa.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/18128468498.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/sasorudapisuverodolelokis.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/46713648925.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6359597f48cc72c1245242a0a9bb2814/38270681537.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbde55a0bc---41731224572.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/75025305433.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/58028241475.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/10122630547.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210717191931.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/guxubimupunotidolevarosow.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dibetijisuv.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0979543d6e5611873435b869be9b27d/nogim.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_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 10652 bytes
SHA-256: 1af38dc0b29e55fe1f70e5e5edb43c1c5cc82eb40788a1d38b953e4ca1ae1482
font_02_sfnt_off00013618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13618 17292 bytes
SHA-256: 71988462f7c7e314b2d89d971de3e6971e006a63ed57363b38bac9fefc3c0b83