Malicious PDF — malware analysis report

Static analysis result for SHA-256 b262a5c961c10398…

MALICIOUS

PDF

105.9 KB Created: 2021-09-01 22:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbfa33a2044f709ffc365cea4bf89fbf SHA-1: 8d9b2b33f72077fad2729a07f3d4919d1494c9ff SHA-256: b262a5c961c103989f0ebedb1cc51b3123f3e4efc07495c37bf8755632ea4c26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations, likely to host malicious content or redirect users to phishing sites. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/77022776363.pdf In PDF document text
    • https://bselink.com/userfiles/file/wegevifus.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608158ac1f58c---pijajobuviv.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0618cedb---38696469952.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/69min9a8iqe1ij3m1sldks3nr2/kefubigelatupazimini.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf406bd63b---39133840615.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/benojoderuwazurefodipo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n4vedh1da2thq29ikmolrle7iu/kevararazuwotoxabozu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124f7d08f68---litutudelivavod.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608593e89acc2---kekixuwire.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/32475919009.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/toganimukud.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/31696914655.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6bv8v76as271985ecimbvsuqks/zonagujopodo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37db1f4f2967ad83121b9140e9d44e01/90945115885.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a83f247322d829048538a16fbfaf5153/povosejexovimemubedex.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/66006339499.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/sekixeromarawumibotafize.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/u681p6u10ckodv2i1d33amo9m4/kexosogix.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/86e7ff19917b672c2301855ce108f4a6/78339691509.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/88e353edd4304c5932d36419ad837a2c/94756806872.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/ruguvosigewesog.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50ae6c4c7---xaromugubopijex.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9206a097815926548af23088f319c59c/82557100429.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/96162754091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=preaching+through+the+book+of+actsPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/12683754929.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e5dbd54c1b884ffc80a3113c2c373f92/91979962716.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_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10904 bytes
SHA-256: 74852da1c937df98a1ebf1d90355f292a936f71d1fca409da02b00bee0a2b968
font_01_sfnt_off00014e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668A 18508 bytes
SHA-256: f2ab065a37477f7b68a9f280b89f8ca44bc71c3641d47daba4e09e2b29512727

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