Malicious PDF — malware analysis report

Static analysis result for SHA-256 20eb30257877b993…

MALICIOUS

PDF

96.1 KB Created: 2021-08-14 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fbdaf237694c503e0e6729377db0d5f9 SHA-1: b00b4fcda75407b8548fbfdeab043adebc8b3a93 SHA-256: 20eb30257877b9934a25c3b86dc30832c4cc134dcbcd423a3bf0d1ca7aa20f23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://purefeeling8.com/data/file/53581912035.pdf In PDF document text
    • https://evergreencans.com/userfiles/file/bimanugikezeginizavex.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q5b4ih3inpunm7p8jhurbpkq6l/jilodufufujalo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/powizamigakijevi.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/zasudez.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/64643514914.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/efdbf1c8b1f056b6f46a09249fbce94f/580671321.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210722_4642625B31247A8A.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj25bb9p8e6567rglq7k4jad9k/mivuvaw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077898299552---rikeligafurome.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/roderofugabosugiduw.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jesegupijogupuwaz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2q65un67n8n3rt5j353d97cuc4/95382261147.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9d4cc62d22db0ee8077ad2ba3c4c5178/vupetagovutukopon.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/ropobigufedusa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/baweje.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/tasejabalewalarimoz.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a657dc367de---8017014181.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a10cf8c8---kirokugodajakuxera.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/wajikenazawoxarebalixot.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rugilovowigekorudubo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fhl960ad6d4pmihbcf4b4modvf/20222366007.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/37563615556.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/daseliresesemewupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=o+seigneur+%C3%A9coute+et+prends+piti%C3%A9+partitionPDF link annotation
    • 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_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 19664 bytes
SHA-256: 77393d4fb30d675d3c9f011a3f716ed85faca76d92f2e14df311ba803e203770
font_01_sfnt_off00013e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E22 10920 bytes
SHA-256: b07f4a1685b9cf2001236b8201d2949754aae1fb62bb1bea7a4c13006382046f
font_02_sfnt_off00015719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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