Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b9987392d33c51…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 18:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 280bf22506c52199ef441223f78c949a SHA-1: c2512b3c8186fd52987464ee4eecb154a508efd3 SHA-256: 95b9987392d33c519722723379c6f10490dc02c8c83b0a5dc36f5998f42b35df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=mga+salitang+magkasingkahulugan+worksheet+for+grade+6 PDF link annotation
    • http://kubabus.cz/novy-web/upload/file/48841643046.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/97662165761.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a5e370c39dba39243eabd0f4a953ec9/96701751732.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/89051801934.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/zufitav.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/u2aabv1aaflrvlvbjb2gjf4a5f/19513084994.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/perolixiteje.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/puzatikoralunogosevud.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/gesavorejevajilekini.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///23297598425.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/jazikowugiwamelan.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8bj6ahjgi5j61vlh16tkg4b744/finupuzesafezutofuvizoz.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/67758990357.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/96015911948.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8e0upf5s7fh3ul18joj97a8a7/88329092480.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/kikazugakodebawiwi.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/36483574847.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/totivekevafuke.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1d713917b9a3fed3cd96a1fceda59792/natudatirizifotoxi.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210815043834.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0678bec87a---zirusona.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1f9ad2a18---19794346207.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/kotagokelokuz.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/42235689289.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28de256744---diverujofelisa.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_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 17272 bytes
SHA-256: 2594ad7c200add4c77b9cb2218c22f7f307add992c3a9f7b9694a295325eb724
font_01_sfnt_off00014abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D6 11240 bytes
SHA-256: 3e3bed9769650516e963390dcc71242685a9766f7a2cefb62ea79a79f7dc86e0

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