Malicious PDF — malware analysis report

Static analysis result for SHA-256 6808d2e32facf820…

MALICIOUS

PDF

117.1 KB Created: 2021-06-29 08:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 81088c8cd3a7bb8ca9cdb0d203151bb0 SHA-1: c045f8791a7b8b82f138d7a9951966e6bfef3930 SHA-256: 6808d2e32facf8205a4c863df72a22d1be44d3bb4438f44fe27c3cf7faf1eb6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection verdicts strongly suggest a malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vu3etvbk6lrjqg79ervr33pe22/zoxepub.pdf In PDF document text
    • http://gapoom.com/upload/fckeditor/file/71607937703.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/28455332260.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/lt72da76bp4v1logjj45v2em61/litiwozovugikezimexe.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/34296913287.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1eea5f222c69251bdcad7bccd96bbadb/mirijokunisovowewutegotof.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800e5ab288---bipunagugusizafolugamepo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608098aeb8fa6---fovoropipekanufe.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/vuleparitozumubijimojumut.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/032cfe4fc94c5c1bf3a7c2b3f5c5d429/bibuwowab.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7bb332219---15639047895.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f43a51a7---58550996045.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843e37c6d76---88859720902.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb3964d78---lizovediwumurif.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb8d507b9---xurirogavi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/guzojelufodu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jifeza.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nerivewujujepotakavoxib.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/62306568544.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a6962f92---44686829995.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/2o2smtqrvrpo6hfql1r75r63pl/21703197528.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vurag.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/betusazog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=another+term+for+demographic+data+isPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016ff3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16FF3 17248 bytes
SHA-256: 7c45560414a0f640ef3490785dc4ed2d2427318aeef48075bbf4d70483fe5901
font_00_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2E 11004 bytes
SHA-256: e557a84f6c7b41e5d8b5cb7c99beb87b5b8e2017dd9a37b2475782e011480fcf
font_02_sfnt_off0001655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655A 2452 bytes
SHA-256: 47e0889a3d71dac015a4745d8f70771667a6851035ba1d727f36e31eea9ec5a2
font_04_sfnt_off000189a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189A6 23956 bytes
SHA-256: baac7a02413ab60dc72ac571e5303093d51989c3d98b27b172318b2ac12820a7

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