Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4a42143e10f231…

MALICIOUS

PDF

79.7 KB Created: 2021-08-26 22:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 197ef46b479f3e8e40a9932887e84a0f SHA-1: ffc723cef895c3f915741438aa63390999d1c5fd SHA-256: dc4a42143e10f23108c3d72d51b95d6821011fb1859fd77bea109df7373af7e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate an attempt to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ebooksweb.net/files/file/kuzizirajopirefegoka.pdf In PDF document text
    • https://mimpiindah1.com/contents//files/nugisesumawivevejoweba.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/84557468595.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5dbdadf7f0ffc2273d4c1941901f8b51/18378948622.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5402f2a2a9---rajop.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fabirazafatelabosarabu.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/43769024463.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/19068879502.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc9525aa0c---54585927857.pdfIn PDF document text
    • http://kelvista.lt/images/files/50459053597.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/85104929498.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/mududupogiludebaneb.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/kp3dnvfbnaokovgrasfmc5fl5g/bogutexevun.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/11446105284.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/majisarawa.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tifelasifatasux.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/qlje311qgvi0h6qhhhc8j9a8pk/85270559611.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sjtbtr3uc6850bue8e0jqpekge/89840826925.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58486739949.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b27eb8a0b1d3cb865bcd47321a5c8350/jenonevewekugokiwapituf.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/walazidenojolejaza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b8327c9d2ffce6713370dbb7ee525b94/73835263403.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/rolamimugemuvagutob.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///14526418738.pdfIn PDF document text
    • http://gtshotel.it/images/file/66230477066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=connectors+of+contrast+exercisesPDF 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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10416 bytes
SHA-256: bcc0a7cfc0f933b0fb32c491bea248eeffc3e8b64b22a5522f38b69a5ea669a3
font_02_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 17224 bytes
SHA-256: f929ad977fec22a598a7add21af0e6e1c8887a0c106aacb16fea60cea647c98a