Malicious PDF — malware analysis report

Static analysis result for SHA-256 88693586fe2f3839…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 01:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8f8d4db8195de6498a7ecefa6a52822 SHA-1: acbf0ef31eb8e936462111316fc817cd24df33d5 SHA-256: 88693586fe2f38396757565f5f8303feeab8ed50d804bae25985d7ced362766d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this document is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8565

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bon-mar.com/fck_user_files/file/23987862419.pdf In PDF document text
    • https://netiko.fr/img/Data/file/jovikekepofudonegax.pdfIn PDF document text
    • https://mbbs.hr/files/rozuzelomaxurexa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49df8f5be---befeli.pdfIn PDF document text
    • http://candientushinko.com/images/file/76188511333.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/5932994555.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eafffb9f21---wowaxogifobezexekovasizik.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa89c8f6a3---45503775216.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b75cff3afc8a79ede5dc520eca34db60/88294779643.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/34160065755.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/aa037537dcf88f42d6079a1340f9bc1c/29007014973.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/wixisonepazepamuzapasa.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gumina.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a56e2db76d294ef1a199d389f23e45d/linezopumugogotugakawuvi.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610033257045.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/12843809387.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/27b59c94a59f3a1ba123baae95dc9b50/gerovetisakilu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/momomenopavav.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/bepujuzidesox.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3642c0044---53452960528.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/rikovisinos.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/54976128840.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/688d8f09aeb615ab9cf85332d333b291/mipemevinajis.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea4cf1cdf---3610724683.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/88169597716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=research+title+with+statement+of+the+problemPDF 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
font_00_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 18008 bytes
SHA-256: 162e8ba31721e169224047cb3040263a142ffb5714cb6bde452f8e06032f1c9d
font_01_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 11016 bytes
SHA-256: b8a09ec26b9091c4f86c33cf9eba3e1eb9e76f971fa681fa7fb31478ded2a42f
font_02_sfnt_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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