Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab412f11f8165e4b…

MALICIOUS

PDF

76.0 KB Created: 2021-05-20 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3e4b99814faed65ad434c6716c55b33d SHA-1: 354f28073f884905b271474d1c4c4c1068d05cdd SHA-256: ab412f11f8165e4b6adbdda9f0766e4878fc838e63b4b7aede939e7b05e4f7ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8676

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=konar+tamil+guide PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832ad49fc60---vutuj.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/ninevagumige.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ah0a2u3k76apfc5kuckibgm27l/78268048341.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608525caed92f---nexipewuvalorebelewevi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda260458---tometiwapimemonegoj.pdfIn PDF document text
    • http://intergeored.com/upload/File/45864482360.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zadedazaz.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/6749008751.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609784e1153de---12796606315.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/820faa9ec86ce91f66ebc7adeef19a26/vibojatal.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8rqtp78pel9e804ltnrrva99e1/36718153591.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca90acef0b---boroxilugawoburon.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160900876c7710---wilujogumuzeredimabumuv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4ecc7d1b---91917357072.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1977fe9983f149615b4893fd677f80c2/loxekatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 3668 bytes
SHA-256: 3e98e49209fe2e9ffb8720b550b27f88bf5c307038443bfd1965c49e750f1d2e
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 4936 bytes
SHA-256: ba95f6d2b4627e460e68c6136958356f0dcb9362145a2347a106e5e0e522e5e6
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 2308 bytes
SHA-256: 3d665ded7efbd1228fca39e30f8d6d590bb658d17666fb65620fe80e171c3ca8

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