Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d4e3870a206763…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 12:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a369c413858ec29d3dc3446658b00d4f SHA-1: 0c50e320d368a3eda81f2760d834039d7c425da4 SHA-256: 18d4e3870a206763ee8dabb4ec9263e699176da58ed3a0cb95b9819e58de04cd
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, designed to lure users to malicious content. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5251

Heuristics 5

  • 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.
  • 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 https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4cb0fdf10ad9272fdea1486f7d16ef43/43715271170.pdf In PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuwivalabevef.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dilokumuvoviboluvofoxuwe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b7b7ckdeckbprs461bbom66og0/lexavivuduluken.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/novosireruvupilik.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zonome.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/guxasegaveravasukerajugi.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/60547936450.pdfIn PDF document text
    • https://topupdana.com/contents//files/pumogikuzewa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1d5022a---87620176550.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d955ac49919---nasil.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ebad75ad---95695636100.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1fa78e59---jilokalirezowiramibejeme.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/tujojezi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/53968673033.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/99c7d6ce8e8befdb7c3152e1c311c140/dujutezolafikulixojej.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/40453361050.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210813052323.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93c4e38c2a948847c694ba1c4a1c2efa/diwutusuzowudiwigo.pdfIn PDF document text
    • http://casaalu.com/luutru/files/zaxesegiwonakiladebapex.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4ef1ae1e1---gazoriweguvof.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/nabufuvega.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef34474d04a3101b394c99be02bf9744/51276227583.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb4d80aeb9---lawudolaj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d268a7b6---57759204095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=160+lbs+is+how+many+kgPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 10904 bytes
SHA-256: c3ef67ec63101b1ace28bf89a3f766b158366dc6d987fb7b1393ea35e65c8570