Malicious PDF — malware analysis report

Static analysis result for SHA-256 cade357c04c9fb61…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 10:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9038175f63e166d0b6e9547c2e46c8e4 SHA-1: 1df0276d6b9b08b8dc9863956426b72d2f6eef6e SHA-256: cade357c04c9fb61961e2f3237547ab6a6d66f45e7646b6419f9f5722b0202e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9126e1054---42197268253.pdf In PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/85734532230.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e24324068080e05e9790f47ed6d81487/zulupetij.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e4a78535---27571033412.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/39565840287.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/buburaleseninabejuwikose.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63720163806.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/91907189045.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/kabiruzusugulepeteviliw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb8fe1cdc---41117453510.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dabaxitizixoluv.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/malazujufikotowajotizobal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuanhv3scj74s7d1oir2mv28b4/zuroxerugubaku.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/56953300990.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73addf1e---31720383970.pdfIn PDF document text
    • https://digireg.at/upload/karunaloxopolunameb.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/751c83e9ab7152dfafd4eb3f298e100f/5543865264.pdfIn PDF document text
    • http://hkacca.com/userfiles/fuwawijugosaro.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q7v8da6vqt61omlnvv49r0pslp/baleguxelato.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/61780375006.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/k23vdsc2u0e333ss6b8c1naoi3/jadot.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/fuweti.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20286a8be0---21579303351.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/35343146678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cizalla+manual+de+mesa+precioPDF 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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 10768 bytes
SHA-256: b1525c50f20bce377356dde9bc4c175c526d50e0756b58f465cdc32f9abbc069
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 19716 bytes
SHA-256: ae0fb45535a02baf88184fc2074df5b2e5dc8913340df3ae27fd83855ebbad8c
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1