Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c87c8737fe78f86…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 11:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9eabb24d8fb8925e9fff509de844a21 SHA-1: 2a838cee5a3381e944b7a41c59bdc4ddb5061ae7 SHA-256: 2c87c8737fe78f866fa75ecfb46a985f0c1cf364bbe4c90b72ff6e3b4037b17f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable hosting and compromised sites to host or link to content. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=can+you+watch+firestick+on+phone
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4ef3b3628---90263368698.pdf
    • https://sanghvicranes.com/staging/media/15819820326.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142411a62300---11301110352.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418f750f46b---8193299925.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/56261255088.pdf
    • http://vilniausgreziniai.lt/userfiles/file/zikug.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/gurevagoribe.pdf
    • http://rovitek.com/userfiles/file/turofepav.pdf
    • https://ajambary.com/userfiles/file/22716840850.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8492ced58---83078035339.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/47427515731.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614037cfd1512---59691180378.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/51720631500.pdf
    • https://digireg.it/upload/butofevedivu.pdf
    • http://heryeryesil.com/resimlerfiles/74622131005.pdf
    • http://www.blueoak.fr/image/file/40464791714.pdf
    • http://gdgom.com/upload/file/210903001200436674czyzxt14c4zh.pdf
    • http://ipublicity.cz/data/file/xipenemukenel.pdf
    • http://asbu.net/uploads/FCK_files/file/698974827.pdf
    • http://ecohost.ru/pics/images/file/xitidabewuv.pdf
    • http://tecnoservizi.com/userfiles/files/toruwigosuweredenew.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec3a46413---wanakinedatuxefomonazim.pdf
    • http://chiengthai.com/file_media/file_image/file/binatukotibepozojem.pdf
    • https://pastelbuilders.com/userfiles/file/39026489785.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/497c6feb2f1d75a381427256f2f569bb/38244021690.pdf
    • https://helicopterleasingservices.com/userfiles/files/poxasagadop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0d.bin
67c978b3673a1b29754bb25aeff45a172bbc2110c889ef729de3d3fa09ee3d22
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10952 bytes
font_01_sfnt_off0000f78c.bin
f0aff0ce71f9c6918f11d2f09de07ef82d685f183b3444337f65bd39674b83aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 18012 bytes
font_02_sfnt_off00012668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes