Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c22c1d4196a0a3…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 18:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a29b983a435fd15548bf7d2451ad0e00 SHA-1: 60616580beef4aed3009259e42ad9c713f32d627 SHA-256: d8c22c1d4196a0a3a777ae8d3d6f0a325729de65ff1d8fb6b054cc88ea259fea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://dreamsurgeryen.net/ckupload/files/fataxixazowuwobifikago.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ec68bac2122db11aac4db3290e764e3/kawozuzirolepezewasi.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/56782837209.pdfIn PDF document text
    • https://ksboutlet.com/file/files/bizikifakemu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/82960668861.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xomokanusaribafesuz.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f801d1eb545a340e24dd6d005f8b2423/71076505075.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/43100979592.pdfIn PDF document text
    • http://bociany.sk/media/file/kurax.pdfIn PDF document text
    • http://skrn.cz/pic/file/narunijopuwurotugosa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd51d5561---libikufobeje.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152ce35a1f5d---pejedemes.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920064825.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/vuwofere.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/75186299527.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/29461860632.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142996071f49---gadan.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/xaxozujofabapeji.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/51594022789.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zotagikelenivijakesawove.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_D000662F2128F763.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/nawopagaduxite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tube+granny+amateurPDF link annotation
    • 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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 10340 bytes
SHA-256: 2d645c25df573657f06282479124a6ab3f6ca470ec5dccc455351088c9178908
font_01_sfnt_off0000c595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 15500 bytes
SHA-256: a4517ebf32dcca32eddee453bef07ab18e7ac51f94bb3f9755019fbfcd791b30
font_02_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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