Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cb59d2225ebc48…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 02:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1431ab185f36484ac5e8349917966ed5 SHA-1: f988322d39949a5a84721913000d5aeb8d3c5943 SHA-256: e2cb59d2225ebc483eca32f781a9e1c790d91945f6882dc4e399786493cd7970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://medvor.ru/uplcv?utm_term=gta+5+numbers+to+call+cheats PDF link annotation
    • http://sevimticaret.net/userfiles/file/70707432524.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f98aeb10e---resamutodufika.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/gosadiparozajigog.pdfIn PDF document text
    • http://zaiger.ru/img/file/3554383499.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131639f09a81---wuwujuvowotarenurasirixu.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jaladexinebotape.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/74678048507.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/sazakufemaxufusafob.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d487e080---72457327876.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/28352867114.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xafozirapakezudozu.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/noboweko.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210910033156.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/24313479960.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/73466526769.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/perarim.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nofuvuwopugisitenux.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/10874514107.pdfIn PDF document text
    • http://kechengchem.com/upload/files/xutejetoko.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/93038520447.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462c55b64c---wegete.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/sukalivizavokironize.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/43839799760.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/52098687569.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 18260 bytes
SHA-256: e2d4d2ce7c695b641fdc8347ad29fb8fc29a6320a2a81ddd0c03e4a9062ea5ab
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10816 bytes
SHA-256: 947307e404d412399bcf1283a9e414c28b5a38d539713cad7e50efe7185078e5

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