Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ccfc14a61d28b6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 15:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d9d66f8235aebf33ffdd31e8fb6c616 SHA-1: df6743021d057d992f1437cc2cc01742fb1568d3 SHA-256: 21ccfc14a61d28b6ae824bec3aae3b67b0e59bad569a712ec1ebf2ae0faeb2e6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. These links likely serve as a link farm to distribute further malicious content, potentially leading to credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4179

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e4af894a888f5dd3c1214b19b5336435/7711916510.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a9332586804693e596803260f0b8bfad/mesowe.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/27134566681.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/92273930131.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/75128413748.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/23829827399.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/rejipelekazusuresu.pdfIn macro / runtime command snippet
    • http://odessawa.com/userfiles/file/gemelizazekiw.pdfIn macro / runtime command snippet
    • https://travelinnsuites.com/nbloom/fckuploads/file/43589113674.pdfIn PDF document text
    • http://www.og2c.com/images/file/44042354093.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fimosakuxexenuregiwugazo.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/80647498698.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/dufagize.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jowuma.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/83559580772.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/tozanososapawutabugev.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141704c88f90---32848434706.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/mfk8217qvagbc4lg15jomblver/30456019864.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/nitawozudizuvowevuwo.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vewurenasisixaretu.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/modoxomafizabikolatez.pdfIn PDF document text
    • https://reha.bg/content/upload/file/41964158490.pdfIn PDF document text
    • https://plasy.com/uploads/file/patozo.pdfIn PDF document text
    • https://fullprotec.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+best+qr+scanner+for+androidPDF 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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10804 bytes
SHA-256: a71068f938ab28b04a62a3a19f014506a9294f44f5befce8a80ebc3e2b2280ff
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1