Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d86f863a61a1fe…

MALICIOUS

PDF

91.8 KB Created: 2021-09-11 17:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d28e2358c4c8100f6c37b629e3945563 SHA-1: e1bb8551ff5e695d64df1ccd064438263cd10ec1 SHA-256: 86d86f863a61a1fe92e54bd0500397ab1a1bfc5a9af042d6de30b2009de2dc1b
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm pointing to potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of external links and a 'download button' lure indicates an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=hecht+optics+solutions PDF link annotation
    • https://capecoralliving.com/media/file/tamoterajebuxu.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/77628159935.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613891de12ca8---98258168277.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/bubefigemiveloxumupedop.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/jugatadetolesaparazaliri.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/36359677170.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/fujafig.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/49082213056.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/24197578716.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133831ce772d---kewibegefifinupugasu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/5644975544.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/15500025922.pdfIn PDF document text
    • https://ms02bet.net/contents/files/32337976978.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/saxen.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/92659274915.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcf19466---94578328102.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/83709060058.pdfIn PDF document text
    • https://curvy.tw/upload/files/xurejomo.pdfIn PDF document text
    • https://biocoils.com/img/file/95430303846.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zolutinirokuse.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/93876218322.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161352286155d9---bobugazepogipawule.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210909173824.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/64057150709.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/jojulexime.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_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10300 bytes
SHA-256: b55e90e119c58881f4b1c5b74552b5fd218f03eaeed34444644d1f248e04d8b5
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 20724 bytes
SHA-256: 71916fa2a615354bd7b5944d93a3eb15c6b6f87fe410c9d515d52cbb09e09195
font_02_sfnt_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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