Malicious PDF — malware analysis report

Static analysis result for SHA-256 184b67fb8425fd82…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 09:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a5539400eafbf9c0acf34caa510a0be SHA-1: 88b152cf1233abf49498c681a10c5746829f34b1 SHA-256: 184b67fb8425fd8262d27f83c24122f39f41e57ecc39eadfd834e6f750386648
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://crysiq.ru/uplcv?utm_term=second+conditional+multiple+choice+test+pdf PDF link annotation
    • https://soalmatematik.com/userfiles/file/30125875330.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/35248648159.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/57560198744.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902075329366.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/56569910574.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///43747214391.pdfIn PDF document text
    • http://voijin.com/userfiles/files/divoxogezilelamu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/66863646849.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///nusibolekedun.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/378095d2cf1611a53a6dd10d7a68fbb0/wexemorokinelofamapebi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/71970726777.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/68191859177.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441d35bf85---fijuwamu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c3a4bdeb---wuxokiburizofenutivige.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/33472854835.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26bc62308---96670011461.pdfIn PDF document text
    • http://shamayachts.com/upload/file/33401683011.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/vexaxel.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/sazeros.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kotadarosawebulakufume.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062301591625.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/bibidaw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c9c42f156fe60d5548a95e5852fe3161/dutaziwazofexukadavofoto.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/82697371288.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/efbd1b11b1aebeeaa4f9bfbdb6c191ee/lomedofanorunabifo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74ec0f3961---53433950025.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10960 bytes
SHA-256: ebb47608858093dcde2771d692303a96089b059610cdb93d713ca3f6069b3833
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 17652 bytes
SHA-256: 45d56662d1208417345aacef40049da893111bcda88926b231724dcba0c3a873
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.