Malicious PDF — malware analysis report

Static analysis result for SHA-256 3485712a824a4c6f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 12:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72b4c77d714df08bf49985a70ae39f15 SHA-1: 191715a2ac1801412a8c4a19bd8f90580fb2d8a0 SHA-256: 3485712a824a4c6ffe416d279ceab8e296a44b967246c6a5a5d943770c59c9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites under the guise of PDF converter software. While no scripts were directly extracted, the embedded URLs and link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5562149af8ac119a43d65a3ef60e4810/rugaj.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/d3a26bf5fd0ac23057dbd0d77c37fca8/98794595641.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/xutejikedivamadorewolupej.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/51768225870.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3950687c---pimidasevolixidetapivix.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/gejelopovofowefifis.pdfIn PDF document text
    • http://deforma.it/userfiles/files/38738499488.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/krqpvcplr9sqm69tsgecbdvi9d/govil.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d701fa2473---21838405612.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210815_F91678EA711147B6.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e9630214b6173b3931d9b5fcdeed05e3/18997691238.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1f3c871779e841bb2fc983c0f99a3b15/93479854096.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/90344229888.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/50394861022.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kilefozebexavatanujowizi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/meripozalofizubisi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/53916887623.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/sivorevamivamulilefumov.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f243e18155---sobabusega.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6be59c981745c6e5eec41558a6dde3ff/gomeloxefefemizifumog.pdfIn PDF document text
    • http://distributoram.com/files/file/pitup.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7270106fb---69657245636.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/39890087043.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/77560474020.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/880e3ae618ae7ff55e96ad7128e4f3aa/67878711777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+converter+software+for+windows+8.1PDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16908 bytes
SHA-256: 72d0c0c8560017f21954a523eedf8e6cddef48b51eecf892cef72a04e50b8a02
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 10900 bytes
SHA-256: bb3a6d5263f674f88656d28666c03c24d0bc76d2312443cb77a243c7c0862348
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1