Malicious PDF — malware analysis report

Static analysis result for SHA-256 162aac5e79a239a0…

MALICIOUS

PDF

62.4 KB Created: 2021-10-03 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 254adc5bbb144a919c2e0fa7b5f38b94 SHA-1: 3266080dc755bf43a5c491ec6db9d40f796427dc SHA-256: 162aac5e79a239a056d00ce9bc25da8e93a5b5f6ae189ac79f2e0a99ff0985fb
174 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns, and is flagged by ClamAV as a phishing trojan. It contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 62 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cengilli.com/icerik_images/file/jasadalevomamuvito.pdf In PDF document text
    • http://redeyeldn.com/userfiles/file/figozugifijijidaravum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161571aa60da02---vobatumivizimunawefuz.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/36721775112.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/noxejekotowuxo.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/41643539915.pdfIn PDF document text
    • http://gekon.net/userfiles/file/2603325137.pdfIn PDF document text
    • https://projetovm.com/uploads/files/2682661739.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b497225e3---4836387701.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/25224487877.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901084211.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/robipalepid.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/63433216262.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mopuxigawezatutu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/21005581259.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra7g90a8mn61evbf2e8m7me142/ledamijeva.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/jaxotuxekas.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/81132375348.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/28b9650d9330205dc3b6c1bf0d48d258/88576172915.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rutamilisojemaritosugem.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/18684874501.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/70380734384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mustang+gt+murdered+outPDF 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_off0000ac63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC63 14180 bytes
SHA-256: 7ffac96f9b4716ad07cd538fa2180e99d7acb3187b7a33477d2adf88ff70ad62
font_01_sfnt_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1