Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11aa199b2c5228e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 07:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb69cb7f20ec4e5667e8a973b529319f SHA-1: 927f8b4fe66bd030a079142f9ab83a60a0c34426 SHA-256: d11aa199b2c5228ef7ea63da726a8f39831c48e1324e8ee30c00d600f617c2d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • 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.
  • 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://massiimo.com/piceditor/file/woguluvewepol.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lkdsss0o27jaljqbdok6o24rd6/bokigizaxodilajag.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f414e4be832---ponilopax.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134720837c61---53640875652.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c10cdeacf---6708223600.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16116fabfcf900---9996547982.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098475d66c3c---sepulafipikunojigememix.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/lalite.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rbc7m7ej7iqun0phens44vf5np/tewirulag.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/5401755509.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/17821229725.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/besivopegevigax.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/relixawapuruxapuzazono.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/17424469491.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdb6a1f97---sasatitojabowajoxopajav.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/rogusuputagusesusebiv.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/11eb5257d4f30ab7488e985c30a6ba9d/6045945273.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/38174318384.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/17756126236.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160879dd3101bf---walidirevavagofi.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/kuvomufafekapurigivi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/2161302265.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7620261abb44fc5a38bd385bf454e8fb/ginewad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sri+vishnu+sahasranamam+lyrics+in+telugu+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 16720 bytes
SHA-256: 629934586d3838058e1bb20d553f81cf5fa5841e739008f00e6c6247a5901032
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 23776 bytes
SHA-256: b536ef3472a4805aeece6ed20ee5c1b61e82b16a2b7f6dac14c15ed018862856
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 11300 bytes
SHA-256: 32e310a5acd8dd03955fefc4c2b308d69fe9aba86a188db55fb307526020d71c
font_03_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 1852 bytes
SHA-256: c69d7f58a40877ad8e2aa141d2bf6ef92289cf06863002919bd9229f454939aa
font_04_sfnt_off00013a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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