Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a81b94e80e8385…

MALICIOUS

PDF

93.5 KB Created: 2021-08-12 08:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e7c61c7cf5045097cdd9e4d87f07546 SHA-1: edbfde7328a85a972bda5d3ff9dff0c028908366 SHA-256: 07a81b94e80e838539748812c1b268b1eacb79e5806b3c2f8e283a6de7f54e9a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e490015543d---72954126788.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd87aa6bd---67583419006.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608067574c755---37518814075.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/10873633227.pdfIn PDF document text
    • http://apcmagon.com/userfiles/vezarupivi.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/vobekifire.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/61117420471.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/lidusuvikokuwa.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/fodanijejezusijavab.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f4bb25de7---pinepamexaputunenoti.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jvk3a50eq9rqg6trq9ncj0mto1/nexilulipev.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99dfc1301---logazimevogopewalu.pdfIn PDF document text
    • http://limoride.net/gallery/file/pimotawozedojefekov.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/bemakawodurowisavizorew.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9838a639d6---31815800823.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3iv6dm35qv105tk9b85asu5r23/32953028360.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/28791776453.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lodamufatasim.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d7ea1043fe67c6db706e8608392ae46f/kogodaxaditatakob.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/67785370536.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wikibenug.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/kipigebarofebala.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/vogirabowan.pdfIn PDF document text
    • https://telorgabus.com/contents//files/nowalota.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/8353448904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ah+kalbim+sanam+re+mp3+indir+durPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000149a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x149A8 18304 bytes
SHA-256: 6a99339f3d2c661e58f0615aeb51eb7fa5ca6a8f381f48abbbd8eb5e289cbaa6
font_00_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 10924 bytes
SHA-256: 854e3487344f95925c1d110170462bf27ad966e8615946e30aa599ee61bcb771
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 19444 bytes
SHA-256: 32ab855d7d67dc9320a224559daa90ded2622d9b9563995a914c6f72c09eecdc
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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