Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bf80cda50218cf…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 19:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7cf984e65a44064cbca3d3319d815fbe SHA-1: 1df37b172b10c85d55f14f58c26f5815d87d748a SHA-256: 10bf80cda50218cfa93aa59c7b97d91be98911704c520b84fe3da555d25d3db7
132 Risk Score

Malware Insights

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

The file contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, strongly suggests a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3127

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://le-lemniscus-incandescent.fr/ckeditor/upload/files/52109462671.pdf In PDF document text
    • https://dehayemek.net/upload/ckfinder/files/potipizozofowel.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/10575913743.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/duvofanejapotur.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac315cc05---66668184904.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/85182273057.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161301b8887624---41250442671.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/78117371141.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/fodixunuwumuvalisume.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/romekamaxoje.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70729035600.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/99428653492.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wixawenateved.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/72865347005.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109081548573682.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/gemobulol.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/punumivowezeput.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/zabejasesodapusirizara.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/62896549030.pdfIn PDF document text
    • https://kaimano.it/file/vevutizorikidopokajiruf.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fefinenebosoganogilopedo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a1d45597e1aeb6c17c128c59fe3c9fe0/32405331638.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tm3krt5nc8dblvq7pjnv9tqec4/24400757506.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a33038409---wuwofitakabadobubipo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613808fc8ce69---daxirokijapaxosusutubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=after+we+collided+anna+todd+pdf+downloadPDF link annotation
    • 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
stream_004_off0001237a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1237A 14268 bytes
SHA-256: e04fca6934264e2bf1aa2f2faff66e90efa47836da0c4fce4219616b5460b714
font_00_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 16984 bytes
SHA-256: 010275b1bb4ef66a5bbb237f4ef992939a40a802411e52f2e075aa10ac8345b9
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10512 bytes
SHA-256: 42a0ca1c03903e57c04527accab00493481a02729c2e1acce38befdd45c39875