Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa710c540b2a8db…

MALICIOUS

PDF

84.5 KB Created: 2021-07-27 16:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76156b13560d580fd5097e68fd531cdd SHA-1: ab59004de31731f201a60ce4dc5426149c7da1c8 SHA-256: 6aa710c540b2a8db1f304034118edbff35ed98c5fdf63985bc521c421fa82b69
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://vresponse.net/userfiles/file/mirowoluf.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/87226172577.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/mukaduvokakewowud.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/43469024919.pdfIn PDF document text
    • http://allasclub.com/campannas/file/17590790732.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/dotanajojatabidopugo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d948e3162d8---12660110161.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/piligogifomup.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7fe633faf7801de3479d0f3e410569f3/viwubojadimokitukufoxino.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/03e11e9d9ef4b520ee6cdb8540cbeba5/popigisibuxovomaj.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/dapeti.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gpo9kiqcpv1vastl69f7s4hum6/simipolugifatuzibojan.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/raboxarevukixuwuvixalisa.pdfIn PDF document text
    • http://darec.sk/files/files/94974718014.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9cb45337---32309846344.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/90035185932.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/42780489325.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/inqv8lac9a94cbn486vkhpace0/mawajanomi.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210727192346.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cb4d5da0b0a29a4f8201b42512c7c5c9/barozuwusilalizovuguz.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b576a68d---dawoje.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdc634f89---gijad.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/82640194762.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f227e4c---1975928939.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c40a3600b---wejedobugowotafo.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/52459811316.pdfIn PDF document text
    • http://imi.vc/upload/files/82798089287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=will+and+going+to+exercises+with+answersPDF 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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 10832 bytes
SHA-256: 4389346f37687152dee6ebe01ca23f128e1c29e37e43cb7b3d1a3271f83f54f3
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 17100 bytes
SHA-256: f6ba0e8377377d4ec504cf219439d1aa61db0f39a6528c16f3e0acbb288b7482
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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