Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aec73083359f70b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 15:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff0c50d3e110ec60eda64260a2c42ef5 SHA-1: e46358cd91142c93215de19704c5245640b32743 SHA-256: 2aec73083359f70b12b8965673a2e721a769d85af6c197c699f798d83e8adca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://pistant.ru/uplcv?utm_term=genial+klick+a1+test+pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e670458ab---47039899371.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71ab1d2bd---mitovupag.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff93e2d7db---51914534257.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5fb2f5b00d2679a32427c837a0c101b9/34447592045.pdf
    • http://peneleos.pl/userfiles/file/gomal.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e1b54a28538e5c99f0ffc8603ebbf8ad/88640486643.pdf
    • http://chataphan.com/file_media/file_image/file/60389086552.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/cbk2673dhqgdc0avia77i9dgs7/sebiraxupekitiwevema.pdf
    • http://gemwishrs.com/ckfinder/stones/files/26882132268.pdf
    • http://biotop-zamosc.pl/userfiles/file/gulujale.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c42d8371d9c39d45cce52dbb77764503/lutavigirugakupa.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/lutinev.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c980d9eb1a---teperajobo.pdf
    • http://hainfelderteich.at/gonakigaxebabibunove.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2082cfd9e---24853710646.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/239f98634f21b897d845fba1c89a4739/wukuxikinuranorevumoxuj.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rijop.pdf
    • http://akiisushi.com/uploads/files/ralekubasesowoladurum.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/nogejuzetomew.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/vokuxu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079350475f53---zaxipef.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21eea59e3---veranoja.pdf
    • http://ntep2008.com/UserFiles/File/8548022735.pdf
    • http://giaexploring.it/userfiles/files/87452088051.pdf
    • https://imagebeaute.fr/userfiles/file/xezetalelokagirodij.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b1608a64---70848272990.pdf
    • 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_off0000b851.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 16792 bytes
font_01_sfnt_off0000d063.bin
00e389c98173df0843983b34d9e826847ed820388f2f9b11033998154b382598
pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16648 bytes
font_02_sfnt_off0000fb46.bin
9c5fe7d153843ac4882740e4cc2d73232704b1e515d63ba08a1b5e2edc560d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10576 bytes