Malicious PDF — malware analysis report

Static analysis result for SHA-256 65331c375aa4f9d7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 02:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 489c8509327ec8de4b95e8a460e9a959 SHA-1: d3d386dcf305df6dc61491c6bf2efc3a3259fbdb SHA-256: 65331c375aa4f9d73fae4ff8b0759e4216701c14eb7da72eeda324d6bd934ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged 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 multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to distribute phishing content or malware through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=lirik+lagu+eddy+kim+the+manual PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/09f36f4aebfdd1295493751a10c26bc7/lafoxufobamotowidupusomi.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/46004371718.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/59545250987.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/difiwijobej.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82e437afc---99772290214.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/migor.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1c5d6a4e93b78412b2a15d3187ebc40/48107872683.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zazunipezanugivepe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f4190850---wabozojoko.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/616307b20649e56a5e68cb7a82cd292c/80433638664.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/gafinefusexovegot.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609352acbd9d7---61095264425.pdfIn PDF document text
    • https://ka-base.no/images_content/file/vuzanotuzudesusumaxuxexes.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/9878364306.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/si7r8huph70ebh8nlcdj37m1qd/guxakatozolikejoxugus.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/82807087755.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98fb67b03---59406622839.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/72259994699.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zudipaduvopalewak.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fekezebibe.pdfIn PDF document text
    • https://ptogel2.com/contents//files/86689308495.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e3b111d3edf550d2e57a746ee635b0f/keralasori.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/2095598693.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vugokosokorokiwomapipen.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/45235980504.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_off0000bcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 10668 bytes
SHA-256: b5feda32289adb129a48b9c7e698acc5eb339a8b98a5321226c2856a30cce9f3
font_01_sfnt_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 17824 bytes
SHA-256: 82c3c9ce0a74b36fceb8ca49c178ee61e6705c8423d9446e69029214e9b7ac7c
font_02_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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