Malicious PDF — malware analysis report

Static analysis result for SHA-256 782d3c78a5761a8b…

MALICIOUS

PDF

85.3 KB Created: 2021-08-21 20:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cac36b8dcd123e4a6b4fd17dc6003f0 SHA-1: f6e1885e2b16a3d190c5a18bae660d56c5b3672c SHA-256: 782d3c78a5761a8b2c5baf3d81a0fb134987eb97416712ee1eb78aa36822bcf2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The primary attack pattern involves luring users through a malicious attachment to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6157

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.
  • 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://promador.pl/userfiles/file/fumuvewadefe.pdf In PDF document text
    • https://path.mn/userfiles/files/jidabojeb.pdfIn PDF document text
    • https://songhong.info/userfiles/file/30236869582.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca0713a135---gekumikusu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/68663688642.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9cf17d42---69023836584.pdfIn PDF document text
    • http://unseretochter.ch/images/file/wanewijeje.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7d98b0c87ee62941de1c0d77f747124f/wavunuzebarodorogulep.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645450850691826941.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/boxixafumakibem.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d0b0c0ca258288bfea53faf84b9911f0/wojizelomagawenapefeloniw.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/29390842064.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lnuijko98a1ildlmhv96fbldl2/nuradizodi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8a803234dba603a4efd85672d9b6b205/80405223784.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lezutimug.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sifiw.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lieagoncihka8dln2c2pqd3jjn/xiwovuxawadinegosinifelef.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/27ce4f81bc8f36878e9d9a72bacc8a30/69279349199.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/87760739229.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216de78dae---45558986938.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/28186923378.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/23676744900.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/savorititi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/marogeze.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/68224801964.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fabe82c487e24fa962b8fca8da6c563/74911782618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aqa+a+level+physics+collins+textbook+answersPDF 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_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 18156 bytes
SHA-256: 081023334038d211a5c3d787781442bfedb6693c4efe33f5169086f7206a95fa
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1