Malicious PDF — malware analysis report

Static analysis result for SHA-256 439d5449283be297…

MALICIOUS

PDF

62.3 KB Created: 2021-06-29 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11a6f4e9da7404bf7bd8657faceaebab SHA-1: 4cde3cb1937053776e7fe5adcbf205ddef31627a SHA-256: 439d5449283be297f97f471f1eeca8d949f049735c6ff0c658b265f5cded2082
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites and disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

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://www.serenissimaservizi.com//files/xunerikexugixorobiw.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n097aseko9j72qujo0l1lsl2c5/16635926428.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/soxeguwazi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/pufipa.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b03a7c40c59b68ce48bc2a40657d7e18/remodagamusep.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1bc3d77f---32259989132.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/buwedifefubituvowu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f95f12093---xubejiw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2e38esiu5mrob2s87phkrqm7k4/36390432669.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/efb88af35b8d833d1a001f4d9869ddde/davufawovi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42865470799.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/559f0a8185f06a0003d2743eae133a13/rijisatefi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tjb62i12ta9ik5ccfstj7ch2io/9997775286.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/19489053013.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8e3aac941e9f190ddfaec101f9349cd8/vasusefavojudasokebudaso.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b03dafe9b43adbea81ae44ed66e9a916/91952920764.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tatogizubasam.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/golujovaroxevafosiliko.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9f8dcb79beea79cec4bff3e32a2df7b1/48151360488.pdfIn PDF document text
    • https://jotelek.hu/files/file/jolevupupubazejudonunimaj.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wikox.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2a6486160b4829fce2a2a947b9ff2134/2367077286.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/245d903cf53fdec18fecfd677df1aacd/japegavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=online+pdf+extract+imagesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 10972 bytes
SHA-256: c203de49abed05b4b9206e96a7dc7f40a7ad2529ac41bc45ff5ce760b345a248