Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa36d40d51f67b10…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 08:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ff1fe4f4a2cc008e34262cb2f854c18 SHA-1: d5a17703abaf5e28414e97154b9c6d446f2201d7 SHA-256: aa36d40d51f67b10cbd5ae2e2f48b1d9d3396c501f020e2d2a249ef9b5bd6f83
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=docker+certified+associate+exam+dumps+pdf PDF link annotation
    • http://brezov-gaj.si/uporabnik/file/penijimekemaduxefojul.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2ca25811245037764143a0641001a09a/76883225444.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/wasodezeju.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8df52a27216977267dc52a1190b83b61/70874910494.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/vutinivimijataxolaraj.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/10727418967.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bcba4a336b889f1b8b5eadd925a592f2/82148645093.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kodaparamibejize.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160984e132c0d7---sivatiluxisudikuromobi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4dc46b5d1a9dd221167f0eca88af50df/lojokoxoli.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/xujimaganagedis.pdfIn PDF document text
    • https://shinaltd.ru/images/file/rulenimesimekisexulo.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/98907934232.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8e110494900601d47d43c9063896fb44/24452640020.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f0d6dded---20364172436.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0d548b6f354526a1e6191e2e2be03950/sopabedadedatawiluduza.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210807_002337.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/xapefu.pdfIn PDF document text
    • http://bakoca.hu/files/file/59488410460.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3488fb51d8e3d58b9b03fc51a92c8071/duteku.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4ff7f91a---dulenetonakezipabi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16116fe7ee63ab---relajewagasija.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lixananiwidilojoviviwesam.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 10928 bytes
SHA-256: 5eccd0133696a3342b6256dcb572fca35048ba9493ff597f8115b569069e5bef
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 17888 bytes
SHA-256: 5e46884893e163159f6b049186fada32d093c8f6b0a3af6464d14231a9f7317b

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