Malicious PDF — malware analysis report

Static analysis result for SHA-256 5617f560ca3aaf4e…

MALICIOUS

PDF

65.0 KB Created: 2021-08-22 05:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fa3a4ed50e547788bbe39abb2cfe449b SHA-1: 8568d4de14803ee06873f9ffbcd3ae4c6c98ddd6 SHA-256: 5617f560ca3aaf4e696bbf97e2d6f00d61a0288b7b4447093596c2fcba086321
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload directories and other disposable hosting, strongly suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8394

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3eb4783e1---xopigonogowixawov.pdf In PDF document text
    • https://coil.hk/upload/files/nemimomotut.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/3291805462.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f133d5c09---89028302478.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/65241797664.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/ladime.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bujawomoxegepamugabizoke.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999d958a0b4---rosowabemewuvivixaxotulox.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/momabiboxixukidifesoset.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/zonunemojig.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5e738dd1---fagukomejosozew.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vobogizedoviwog.pdfIn PDF document text
    • http://chieucoingason.vn/files/3235792001.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/i4o8s11auoomh532oqqao268g4/ralutugofudixanabam.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/620bc71e272c32682d62469337f31806/kareveji.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/fimebonenasidi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7pf9u7p5vmjbu06nnmd3oe7ip4/90555535657.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6e153d43f789b65dcf94f77598d1d74b/ruwubalokikobobazarunozu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/mofibuzoxononiru.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/sabejifipowako.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/9819143127.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f2f962533e---15459372207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=digimon+world+re+digitize+english+rom+downloadPDF 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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 2824 bytes
SHA-256: 6c917b8f2009cfc9d2d45e46e71d3c81d2e29dfa434546e6c648de70733ce123
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1