Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c048963640defa…

MALICIOUS

PDF

88.3 KB Created: 2021-08-30 13:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6646afdfdfb2426aced1a0b94d3e133e SHA-1: b4e3fa565c7244e327790790112ef4e712c745d2 SHA-256: 26c048963640defada978d5eb730cd0f38afb08b14c4c3662f07c59b4a16bb6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a significant number of external URIs, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. Embedded JavaScript was also detected, suggesting potential for further malicious actions like payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goodmix-psc.com/userfiles/files/wiludipirozelej.pdf In PDF document text
    • https://beruanglucu.com/contents/files/36794106410.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e527a0a0---fepilifidubiwomirigum.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbea6033c0---12314089448.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865d95f0ea3---vilatebutajonun.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/36790959813.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/76668390396.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/bekajimabejobivone.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/repemeberokafuzanuwu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5cec6dec93d21f77a9744e2af141dfe2/71867808818.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/64105219653.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90686d539c---xekorozutukepuzelifa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/3662585674.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/banukulitasis.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/84057948948.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fb27584b2---mifuxikuf.pdfIn PDF document text
    • https://schmitz.cz/res/file/78793632362.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81230089---36394014224.pdfIn PDF document text
    • http://protok.pro/upload/files/kuxezi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b1f94ef4fadfcd1644c44e8444726b98/8747975641.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aa19eac0ce26437dc1f0a5983feb5392/81884401565.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/93711468978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=papal+infallibility+definitionPDF 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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10476 bytes
SHA-256: f61914f928ba0663d9e5faadd5da604c59e7fdd21c13752e38a890f91ab15a45
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 19804 bytes
SHA-256: 268d3737c318b60798cba877b29f609ca498e31dcbc4f5ac63153df2e3bc0dfe