Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaacf993f3c6aea…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 03:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: befefbb4d1c289e570d9dd5f6d4849dc SHA-1: be1654e5f2c5956e03ab5763825c78f23066250e SHA-256: dcaacf993f3c6aea207d459255b2afc3a6e20577a3f462c4294daa04e8496f97
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alliance-ltd.com/userfiles/lapofupodagaxuwipakomi.pdf
    • https://ijp2.com/contents//files/47187091812.pdf
    • https://alatheir.com/atheirwsfiles/file/23968371469.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a3f35c8a---wolezivi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/56dedb6abc2405248a9d2667656c4602/nomagexipeposurego.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/756d2c0671efa12c96b027c80eb0e914/tadovatawujegojenodilozos.pdf
    • https://ivanamihic.com//files/sipusabozarobogudurusokek.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0b63857f48ee5bb9d940f0914887c93e/kifogimunokepagi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4dp8gt2d4vlm2qu332igdke56i/kenosawujok.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f45bde8b---12899574133.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/296ovahkcuif7ljc6mgt19vtp7/90583722791.pdf
    • http://monroehighwildcats.com/clients/40160/File/sejowekowuzufiludimuveb.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/88318928901.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d749c452ebdc93a452c710fd2697b52c/wijerurilodekud.pdf
    • http://bogelaipigeon.com/upload/file/bifigimafademimuronagalu.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a16b66d---vafavemimuzapazowe.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f082f352f9---45414727933.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd69105f5---64060863738.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/22623068123.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/16ed83db5764c627c7a7febbc92f7822/xetolesome.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/gageduzuzawasegufomu.pdf
    • http://tdsns.ru/userfiles/file/43940127880.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94392c5f18---jigewiwesoru.pdf
    • http://kursadowicz.pl/Upload/file/49168866403.pdf
    • http://atthaya.com/file_media/file_image/file/kifiralibufate.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db09e26a34---nikowika.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=was+were+or+did+exercises
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 16792 bytes
font_01_sfnt_off000115bb.bin
f1f8bc616fe749a5e2b4309d0ae7a7a38fb07f609ab6aebfa4b4bd4e2bd9a68f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 17332 bytes
font_02_sfnt_off00014306.bin
5441689461247c2f74ae4698e2ee56625b404e04c884e00f15ce1de7c09b0c2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14306 10296 bytes