Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7c37441a090521…

MALICIOUS

PDF

87.5 KB Created: 2021-07-16 09:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee7e2ceda6656425684024b7e3d52272 SHA-1: a07f98e179e04e405fa5f99749f54ac8617b2692 SHA-256: 4e7c37441a090521a22d81fcc0b679eff418b199829fe69c39619187acbeb43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=geothermal+energy+heating+and+cooling PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d42c20706---27781273663.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9e73ef95---xavawidiviridupanak.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160753e815f029---90206392466.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b200df2c8c0---9034271267.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592e9f12c8---wepewikomufiwinivudowifo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/70a8c14ad75c6f2d1efa118968bf7e59/54129722880.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/fuwidokosafobomalipola.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/55893373799.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088abca5e6f3---lefurumezoguzovefa.pdfIn PDF document text
    • http://kesifveotesi.com/files/wavabazopaxuxusipumagi.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54787061188.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aed0830cf8d---40267955319.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2b34085c7---getalovu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qmmcnnvblps0jb1a5299vg4u02/26499899578.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/39816760016.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/dodexafep.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ngugfgk6f136mqnak5ctae84bg/6574947182.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a0b3e593---dosexisezalumefo.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/dipanigokima.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607541862aad8---fixawejasaxeg.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/33140716590.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/18790548806.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ba8bea36---28528317162.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094528b97a11---19659121749.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/kijawuvilivuzipar.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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 17236 bytes
SHA-256: 54a25091e6d7529c7fbad5c1555215ce7685bbf66816591ca3c033d72149b391
font_01_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 10800 bytes
SHA-256: b5d0fa23193bc4806b037d9e62edda78cf137dfadf5fe8febb3be97b6d0850e7

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