Malicious PDF — malware analysis report

Static analysis result for SHA-256 8993ce7facd3f030…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 09:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 987050d361982c6e5619ad1db5628d3a SHA-1: 6586e860e72e3748cd1a194ac5a4a1be301420ff SHA-256: 8993ce7facd3f030262e8ef7f60c8cf32b2706b5c65a8005184a82ddc6cc3880
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of external URIs and a link farm suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=jumbled+sentences+for+class+10+pdf PDF link annotation
    • http://cke.hk/userfiles/sisigulogezozi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ffd554ce99b0f8818c1abb22d5bbf2c8/xasudegokimedosit.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/22630180893.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9dca3aa89b653a038ec8b86df84dc195/vukarebuzerijepobedago.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/63872977268.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/oi39uke4n8uiu628qrhbj7taak/noxotaditotebe.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd00b4dbb---wujetufurenebubemidepaw.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/6552965391.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d3260490---34300379496.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11164ce98---59312905194.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4d2ee54b---80309887576.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/85016195668.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e615d7ca408dd1095696d998122eac44/29015060447.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/56944349492.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3198d5a8a97793f07cb7ebd571794e60/10770001110.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c951bbac327---52180202278.pdfIn PDF document text
    • http://esejsc.com/upload/files/bavizi.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630428931/files/45641164569.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/wokijurad.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/firojugusuvojapabugilujo.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/famevare.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_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 18520 bytes
SHA-256: 1c60234d7203de850f4d0e2be0c8827b8a0ef6a645b40797d1b83d1b92b7436c
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 11096 bytes
SHA-256: 280967ddb7c8114a618d672066ca0122a733648e1567b74c308afc770ac3514e

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