Malicious PDF — malware analysis report

Static analysis result for SHA-256 e653eb2bfc0eb750…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 19:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4682d302fd7139011bd670462fcc1e3 SHA-1: 49bb5eccb5ab63928d0c06d4a3d3e1dfb18292ed SHA-256: e653eb2bfc0eb75031ef8e3295783612a13ad31bf9b17ff2a3377cb5df695090
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, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lure users to external sites. The presence of a link farm on disposable hosting further indicates a malicious intent to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kleinschaden.expert/userfiles/file/kisosebotipanifudemakib.pdf In PDF document text
    • http://campbellelectronics.com/uploads/mofufawijojejuwibu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5920079ba---wijoxo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52685404700.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6077b5df9---86533632236.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/91825548452.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/214039697060ac961378469.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde9d317c9---dozakitazexolofaxavaz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610314bd1c362---xovonige.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100aef8ad877---bozivobefiwirolorezifo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b182b4f2a5---31949950557.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/rofobewifazemobim.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1498370b3706598682b9723f334ca7ec/bavegijoniruvunesu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79c1eafc405b70ddf695f0e2e2b7196f/4120165253.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fa0c5e2d---semimaga.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pifibamogilifosunasep.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/vorovelatulumijezib.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xodupajo.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/38513323517.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/10382478308.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/86018215229.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/8596855099.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/kamedobazapu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161138b95ec3c2---zemonimilireja.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb240fd3602---madoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=klm+gross+anatomy+pdfPDF 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_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 14900 bytes
SHA-256: f151c0af5588662a25c52b934bc758e1f017a7a85074aa0d02398d1a605588a0
font_02_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10724 bytes
SHA-256: 226eb0a769594468f4547defe7849ec8889906cbb5c51428af216adc7769b269