Malicious PDF — malware analysis report

Static analysis result for SHA-256 110e6cbf4c4902d0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 13:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e4b9b634248c1953458a9ee0f4672fe SHA-1: ca2470e0a70be9db09950d3c66a3f6c0e3c3daf7 SHA-256: 110e6cbf4c4902d056ab83f55e3f738b1ac7e70e6ace1c0c1697a9c44936ef7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=best+free+casino+games+for+android PDF link annotation
    • http://tznjl.com/userfiles/files/88182504327.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tinokebavivitaj.pdfIn PDF document text
    • http://apple888.vn/luutru/files/57902081409.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c4560dcfdaa5a557addef19453003d46/pojuridugozugaseluj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613156444b9c7---fofugeberemurejajag.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f6b9f9f1---38881061755.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/likepazapejojetaxogogeza.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/31370615386.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kkulhhsu6e51ao68tl0lib0i76/jodetewetubufurufopogukug.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/fivuwotubanejumezijeru.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161442ec3920a2---wufobexafebejizaxo.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/49877204363.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e44b16676c3816f02a2a590aa0b84032/12701135942.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/zibuwefepilufotuwasozofex.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/76140179559.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/xipigaxopazilopabamumuxav.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/766540226141a84c62ebe.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/13064630544.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/92265186087.pdfIn PDF document text
    • http://canvangdientu.com/images/file/makorotusejixadajo.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/rugidekibaturi.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/52351606603.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/bazazejoxiletuxemakubub.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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 17628 bytes
SHA-256: 8ee055a6967e55f5633efcb4efbb518cb7e13b2cfbf550f578bc49276dfe436a
font_02_sfnt_off000125ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 10828 bytes
SHA-256: 0a454b8441ed872095f912353bb0f1abaf176ce1f53a16c880c2448643d17143

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