Malicious PDF — malware analysis report

Static analysis result for SHA-256 628456814d3e301d…

MALICIOUS

PDF

116.4 KB Created: 2021-09-08 04:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d5a62c76cd240f5e96f29237d2b0590 SHA-1: 49806e323e01ab67f0f9b112711c1fb1f4665a8f SHA-256: 628456814d3e301d693782a26eb07f86687e45135283439bf7521edb801ebbb9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded JavaScript and a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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
  • 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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc416157f23---suvize.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/94496311840.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/20c0a6a54b949ef19fe731f54cc41be1/71032547103.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135152c2b81a---57281890232.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/buziwexeworefumuz.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/pomidagamepejowaf.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7218c0289d370ea221692c64cf9f47ff/61168574430.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/tebejasi.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/zusixipumatog.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d43efa26---28853149193.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/aa4a25949d148bc926ceb70d32e8930e/jekomaxifezuwejix.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/gefijorodoverag.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/34703110777.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/23012994169.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/61614910220.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b51cb815---xojogop.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3084da3cf57e27d434500f93e89f95e8/94272163788.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/439ee51fcf6c535bea115aef26cbb58a/dofobedejileduguberawegi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ci3qa55njsuadv1nhfccs2ulv2/55833056849.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210728/file/kosejola.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/vapoj.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zemiziraz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69af51c44f---wopataso.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/31a8b39f8c519ee15e5242bf595ff402/ninotezejokisazut.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/82283653256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=buku+ajar+ulumul+quran+pdfPDF 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_off0001898e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1898E 10568 bytes
SHA-256: e16a95b067dbe1b986ffb1470fb4fd084c2d03a92a586002acd995493ce61452
font_01_sfnt_off0001a168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A168 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0001b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1