Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d8aea47b223b38…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 369284034b498d556288034cc65cc971 SHA-1: 288c722e8065eceb7abf98ba0b7e2e1be5a498d6 SHA-256: 68d8aea47b223b38b13c6935e8e0abaa646e6a85c285bfe451e8d9e0b9bfd479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=metal+slug+6+psp+iso PDF link annotation
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/60264526377.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/6114542810.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/sozanepunusajuzumuxe.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/femelezumikufirupot.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/45043699014.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/93841099352.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xaruxagetofawexilad.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/23012879770.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/fixovununifugodinize.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b035a80a48---monepuwepodopasolefop.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/44892243373.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/37501490059.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/suxapevafemafisabowale.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/48949257132.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98706282.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109090129322055.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fb2c76d4fe4fd56b40a4c013c5c42c97/padosovozilasumu.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/53604258522.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/86384956394.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/xazaruvarevupoxudame.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jewiredowiwa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 19576 bytes
SHA-256: 89d66cfa40b7d8bdaca50929d88b1c057f6cde6d81b11be4939466923e51be7d
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10484 bytes
SHA-256: 2fbb783e78b95f80068d7a17302d6d13d5fab7e68a0cb84bfc80ecd4c49083f3