Malicious PDF — malware analysis report

Static analysis result for SHA-256 019595f67db22b3d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 00:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3886227e65e6294eedc6e0a97b83c78c SHA-1: 2d618a10a471be71165596f864bcf066c4015dd8 SHA-256: 019595f67db22b3d5d42351c46e8119e38457cfa0343c496f49a77f96a7f62a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links and the nature of the hosting suggest an intent to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=hibbeler+mechanics+of+materials+10th+edition+solutions PDF link annotation
    • http://sensitiva.fi/UserFiles/File/76098324346.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/87442273123.pdfIn PDF document text
    • http://hodori247.com/uploads/files/terurefovadiboxun.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/18501707884.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jokajoroxuxanip.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/fazasibude.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/74586154716.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/88851056465.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/95712161178.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb295bc84---fokare.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/1427296674.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/lamimiluwaro.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xegoxerezovupana.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/gerovuwitunadofosopuz.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/31271891651.pdfIn PDF document text
    • http://napiarsaigh.com/images/voralin.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/28491621341.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/35655053649.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a21ed0de---3234433603.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/fewuwazizuwu.pdfIn PDF document text
    • http://xfswchem.com/upload/files/12632033367.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/95897515032.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/somupapek.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/11501951230.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16135b60e6e077---57826568571.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_off0000b880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 11144 bytes
SHA-256: 5072185e5d87a994771868b9b2425720896cf3d29253f63874634731fc22b9b4
font_01_sfnt_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 15736 bytes
SHA-256: 251172ab7fc7a1551fbbf653f00594a0ae2f5e775be472c963d9c73319fd1e17
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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