Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e6bb2c281c0232…

MALICIOUS

PDF

56.8 KB Created: 2021-09-13 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 83537e5051143ea80d875409231e9b48 SHA-1: 5e4ee3186a40ab635982620190aea48a42a78609 SHA-256: 05e6bb2c281c0232cc65c1a3f91d24e8f33138ca89cf12feec4a97888fe90413
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

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 https://inwebjor.ru/uplcv?utm_term=top+20+sport+streaming+sites PDF link annotation
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/35013103647.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/gokoturimi.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/14548039475.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/lekopimopibezudinitak.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921eeb82b7---wopenuxefumotod.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbb7941c1---43791435289.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zexodajes.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/24449466959.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/73901641225.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4ba6a4050b6ce1e74ad66dec0721ca57/26968626375.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/mapovebesipuxulukadas.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/74348842237.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dagoruwasizig.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/38437823476.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905010524941.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/51246985915.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a7c4a01---tomuxidatalatudibu.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/33310700191.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/fomupowalofozotuvalam.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/11709538688.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/46133881035.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72504208419.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/96826789676.pdfIn PDF document text
    • 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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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