Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b37cd01cca0c4b1…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 18:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89d36b34ef18bf072162219d4e9fb4e1 SHA-1: 5b5e7d63393e43f1e0fde897488bc05e501611e2 SHA-256: 7b37cd01cca0c4b1bf87e983395181089b9e6c470cc5936de30b6c673a07db98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fra2ange.it/userfiles/files/62540318094.pdf In PDF document text
    • http://iwishop.hu/file/41004597448.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6057da7947---6024337223.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/161128b2717cb0---gixofixumigovol.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/14818886337.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0up2ee7ob10c9gm1r5i7vi9mf4/kanibibaziz.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/3003979096.pdfIn PDF document text
    • https://wonkingchina.com/d/files/50741995085.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b6a4800ae9fcf866a57d3dba5239610c/96790252050.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/jitujoz.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/rikenanafabiwimud.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/turaxirepex.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/16291814355.pdfIn PDF document text
    • http://gdaniec.com/upload/files/pugumopol.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/fekikut.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46768a6d7---wumigatuwenoroxujam.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210706/file/87503400799.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/02e578e05d8865321aa22ce64c5428f3/memoribepakekufud.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d591ab91e---tezek.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de7333f87---gewabebevawilex.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dakimoxufeletidu.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/jonise.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/tokogikadebetixominuz.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/bevuzizesubuwuxitaxoku.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/eu97kj84j8s8d461eoqc5eln3c/dolikutuvimibosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sankirtan+ramayan+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 19748 bytes
SHA-256: 738b13cc110ba55197ad773f622890fde0ee08e47399190077bb5ed060bd1069
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 10476 bytes
SHA-256: 88ee8a59d69b8222cfcb5c447abc1494721a67749b79131eba7649d438399ce8

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