Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c4ff23b17a224f…

MALICIOUS

PDF

79.1 KB Created: 2021-07-19 21:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c78254f062be18a21d9ef3e1783ba33 SHA-1: d2e7f29a3bae060ee0f6e76abbcb4c7ebda59497 SHA-256: d7c4ff23b17a224fe1d7b62491d4b68dab4490b70b13ca8f957b4edcdbeebf7f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm to direct users to potentially compromised websites. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://agatanorek.com/files/file/82141414029.pdf In PDF document text
    • http://fipjp.com/userfiles/file/duvulesi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7de548248a04c2ac446a160ebd02ba54/saxukulol.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/dizulejuwuwa.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/20422140700.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/fedataravebuwotoguw.pdfIn PDF document text
    • https://unosms.us/userfiles/file/74240781489.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/15968926826.pdfIn PDF document text
    • http://coffee33.ru/archive/file/moxukadoruzovagowujuginu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fae794c1c155e3a2e444b563bdec79b2/negufefokim.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/dapelasakimugemajonezige.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072665dc74e4---suburumijojujazuneri.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8fe8255d1---ropunajopanaseloj.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e540ede195ccdebe8585703ec116c066/35300480109.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/wuboliwowadukuvazonorob.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ptae1j21nad60fl7rvoult5dv2/kurumifokevizofer.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/pujokosubijexus.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9292ea943ce1f66796c8d83e8e7a15cd/zuzizuzawogu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210610175017_g954h6.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb32fea4---madopugisi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5a4d3e3b---tasiw.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cdd5417a---23413576761.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/petojukutezefatipesawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lotto+max+todayPDF 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 9940 bytes
SHA-256: e7bd0e694e06a4bb0e7cffa6be05b620fd4cc7c3957d49db6981ccc2e5ab5315
font_01_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 18088 bytes
SHA-256: 5c38b7acafd25db68a58185cc6643e9e94d836670b6d98e4d4d7a186b2b97a0a
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1