Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf3e33cefd5197a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 10:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc491408d72fdae4ea8036429d4d11cc SHA-1: 708efc8c7dc66bde9706eb8ca82310b98578fdd9 SHA-256: 4cf3e33cefd5197a97830d581adc1c411dee0fbfeded40205b8c3ab8390ccedb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8651

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=does+the+iphone+se+2+have+live+wallpaper PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574a68015c---85972310577.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/faxal.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f40d072c---jolowoxedajevi.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/83982885436.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/43533273599.pdfIn PDF document text
    • http://vlajamo.cz/images/file/87565848312.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3465ea3458a119256dfd152092a2d135/14049254641.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/74539902952.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/95264918813.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/74965100271.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/65101539507.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/naxidaponi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rhrnp88144chg689ddpnc1fed3/45191376924.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e508b22a6d7af90261bcbea9d7926609/lisitogusupatavi.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/22560581202.pdfIn PDF document text
    • http://www.toptehnik.si/images/fitopazowifi.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wigig.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/lumujiwetixoxogekifeji.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/62399371454.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/ziwedituvejopamizesotav.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kalazuzuxikomiw.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab3e19d2---jasazemodugogomigaroninot.pdfIn PDF document text
    • 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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 18116 bytes
SHA-256: bc248621e601367c5d6f8f106413d5da40cfa7719586469f817de377af7e07f1
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10620 bytes
SHA-256: baa5c03a26bd417b37feac2173793dfbc1d9e80a84f766aa6e4c6ce8e96cdada

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