Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a85a098b9ca59b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 05:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe324080a64ad076f8195b49b8c90db3 SHA-1: 055872a8401e2a32a695fa0cdda62013a027a321 SHA-256: 71a85a098b9ca59b23fb95f447ee84ab91ea8ee5fdeb31cb6e952e4ae85a39d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, with one URL pointing to a WordPress upload storage. The presence of numerous external URIs suggests an attempt to redirect the user to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=suspense+account+pdf PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9fbfd1cbf23cdec50168296f5dc6ae7b/64011385437.pdfIn PDF document text
    • http://regcureguide.com/files/files/84649141139.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/niguguku.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/pusegumepinopasedukagofi.pdfIn PDF document text
    • https://stvorki.ru/files/file/bukisiji.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bapenal.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/54133958600.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59178552184.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vdorq6rkdijiger9nefr0st5on/90097903501.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f37824442488c6e8af5072cb7da4e45b/luzumezuzubidumapa.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-26/20210826002213352419.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/17284805758.pdfIn PDF document text
    • https://artenika.pl/fck/file/87562153019.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/munifavet.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a6dc7aa---94555604235.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60780933120.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kixusariledosupamulekejab.pdfIn PDF document text
    • https://signika.pl/Upload/file/14051683111.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1110bd9f8b---xajoluxojife.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/732c8dbd6f573312f53044fd3891a735/31151201738.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/femefik.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/6736383228.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 10552 bytes
SHA-256: 3f21df0d2c25539be8d5544ba75dbb818c355c713bd19006be7ea04b4336d7fc
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 18312 bytes
SHA-256: e0f5e0b74de8f0e334de5b916e867c0c8114e7245a28a963210ec62236e66d44

Open this report in the interactive analyzer, or submit your own file for analysis.