Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b72f92cd31e1e7d…

MALICIOUS

PDF

102.1 KB Created: 2021-06-28 01:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 84891a85948a37b172e68dd4184129d7 SHA-1: c73e318033e04907b0c2e6cbf6edfdb33d77a286 SHA-256: 7b72f92cd31e1e7d439a6f98026fdaadbfeea6b7c30a1c8eeb6027e084f9c179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://historia-bfured.hu/userfiles/file/komuvesiwarilefijegew.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755108177c8---9152373619.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bc75f7869ff88e5e64cb7e33df95ecad/3401472831.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b4a4a7e---pewejud.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/bazivete.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/jefuwew.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/ec79ee3e05f4575a68aa5ed66a8377df/32132441518.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a597054233f37fba2c80b74654643a82/nakiruzodasoxijagumaja.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9630c34d---sifenifepetinatovaza.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dkar5f9nh3v2ksp980g6uvq3g1/jugimulijawofup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ec75267e---46648763370.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afbed7e372b---25318336744.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b136af58---xavapugunet.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/29620294602.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608132480f1a7---2795850436.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb234b470e---lojonipekovax.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6cc038e8882d4b5b985e4650a6bccf8e/71992703929.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/jukux.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/68744530243.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18365b22b---61211823284.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/mijatukureseton.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/452e4bd6eac47c43a151e4fe1e26c8c9/pujabapekoxepujalarojid.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gavuxomekugakegel.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6602d8c03---5365514948.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/86938757488.pdfIn PDF document text
    • https://emmaushuis.org/pages/gejab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chi+square+approximationPDF 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_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 18188 bytes
SHA-256: 01dc2bf2dfaf18ee63081296c14695dd036f78f9e493d0857cab84052485a48a
font_01_sfnt_off000158a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B8 10848 bytes
SHA-256: bbc5b7f39f818368348e10ba93cee0b1a6ed2286a05da0a53d050b6774bcd1f5