Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b4dca0da21850f…

MALICIOUS

PDF

95.3 KB Created: 2021-08-11 01:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 79966d7b5bbc82a90e9e5d7edda7505f SHA-1: ab7ae7da48705478b4275f9a4469ad9b27ccd097 SHA-256: 16b4dca0da21850f81273f90d07d5177513cdf0d92f439fcf0158f1f0fbd1516
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

Heuristics 5

  • 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
  • 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://pcccmiennam.com/media/ftp/file/69077796728.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/29101570285.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/duzudejepepipu.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63843cb4d---lixudirimofesojukofu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e18e65573---jufedigevurubapetaroz.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kololadin.pdfIn PDF document text
    • http://soles2walk.cz/data/file/77896557809.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074772523b91---manaderininilap.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/36956638610.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b32c2ea---lijalugijimupafegirixa.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/2090795668.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/16718515200.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861ac203843---bitexopawukosupunivibifu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c582f1e27---72331351456.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/13094720309.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0f83c8e8---23163352939.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0158d9bf7e---vuxaxedifasosemibopa.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210804193528.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/48610502130.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c54b5eb04f751c9fb21d8fe91db5e09d/18292344054.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/9ad1b9dcbc805ee1d58a6dfa4f6d1ecc/motepekirinobazasoso.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef4425b21ec906d51b97486ce31a632d/21272755575.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/badum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=resident+evil+4+ppsspp+download+highly+compressedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off000160af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x160AF 19084 bytes
SHA-256: 3320c91b2aee3b6123f01eb60f4853c86083f5dde29ad4b59ceabd1881ac2de2
font_00_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 19260 bytes
SHA-256: 96f5ba07128f9752a1dd2b63af300c171925712108a399c97a09d6c7881ad2b8
font_01_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 1704 bytes
SHA-256: 2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 11352 bytes
SHA-256: b791733efb88a67428310984993e2ec08ffd218fb893499f5bcfd24009ae910d
font_03_sfnt_off0001489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1