Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1ae9a7be8db3eb…

MALICIOUS

PDF

105.7 KB Created: 2021-08-03 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cacf40ca5dfe05f70fec383ea2bf93ef SHA-1: e5b00a8e41e02e3e2b36972d6687b36574a9bbc3 SHA-256: ef1ae9a7be8db3ebe98d01b5d840cb19a84ab19b552873287e5b6509d5025b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medicaldistri.com/ckfinder_files/files/81218099053.pdf In PDF document text
    • http://qamsar.org/userfiles/files/jugekatefenuvolomodonabo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf625596d5---77617991635.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27935003246.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/94698051937.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2ccf6a12b3c5c87b028191aa8d7339e3/93588130883.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/30155275504.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/fapekamisogokinonaru.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/74365257081.pdfIn PDF document text
    • https://melz-feu.ru/upload/rogujigagiwetiku.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/lumija.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d2dc0cc27005b7c575f66d95e02f9abf/94852352158.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20216623515.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a281e9c6b9---veboxixuje.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4a37fc666fe354334f9cf91e86968e98/weripevoxalul.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210509202006.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/vokode.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/mizufemabaxox.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609763c808bfe---juxisulujalazodebegozor.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cdf430eac638beb2ef3507dbfe4bcdfe/sefoxutid.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3498b706befa513cf977fd4e5c2e752a/72947551572.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784945ea8b9---45031965493.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dfd0063b4b0f8462009f1166fa6a0fe9/52255695348.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/vojiximawox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dungeons+and+dragons+5e+player%27s+handbook+pdf+freePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb3da81bf---nuzevopariwinimafi.pdfIn PDF document text
    • 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_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 17748 bytes
SHA-256: 6f32cb099bf497a9da0336b664e580db16cedc1b1b1c65050b5180d75cd48896
font_01_sfnt_off00016443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16443 11200 bytes
SHA-256: 0f55d7a3a9244434cbd324bf89fe7272247a071d53b38de0cbedeecb121fc3e3
font_02_sfnt_off00017e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1