Malicious PDF — malware analysis report

Static analysis result for SHA-256 81789fb689afb7ad…

MALICIOUS

PDF

89.3 KB Created: 2021-07-23 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a0ba14eb9913ae0c7d0c755a2d5a461 SHA-1: 8e3113230af4cfd68a16ce670ee73dccdda29c30 SHA-256: 81789fb689afb7adb0c4c1fc914488ec86fe09efc899912495c58a44e6e379f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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
  • 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://ottotech.center/userfiles/file/mipita.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/375bead8b38934a99f19fafb2540f2c2/27636414877.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cea4a4690c2---sakimefodalewugewi.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/womizov.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c4669a48---97401179678.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dd328b435114eda32b9d0029e900f3d4/90459343324.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/094a6aa0988257a2ef37726a66049e47/rotiru.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/fodevefozowe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/molod.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dilazoso.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5637ea4d46---96512621492.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6d34feb6c213d67ff274c10c85cb71e/35132101082.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/3f7584d619640a1e77e9121fb1436006/32061470874.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/dovanizevepe.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/bejimikudeduvu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/56b4f34e8cc677aec04f93e5426cf288/xabusinokorefozadusazuj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ee47de7c---rakagizujezubunabidiz.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefebd4079---93768208840.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/27742807096.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/92701ff363e7ec818f5a2b0cf694fdfe/lelolukodepiwupokufigojad.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vivimefazufovafeter.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/70634624468.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7deab3ce8---58529346029.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50193423795.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095caadcb7f9---metijux.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a821abda880---57240652300.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57856466423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fast+typing+lessonsPDF 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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10420 bytes
SHA-256: 84b3c8af628221b3cb3f9c4673ead2e4843859ff7e173f08484fdefeac2573bc
font_01_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16968 bytes
SHA-256: f0b9b34792ea4f4c5d8c24e7b752ca72f7403d6248d357148c34547c936bf84c
font_02_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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