Malicious PDF — malware analysis report

Static analysis result for SHA-256 36886939d0610615…

MALICIOUS

PDF

233.9 KB Created: 2021-07-30 08:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b156d18ff66327379667b49f6aae25a1 SHA-1: 3f453121aae1ee9f3f1af6257ad17e4c1bda54d4 SHA-256: 36886939d0610615d38709b378648f6d9008162ad10574a722598128d26a10b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is used to host or distribute further malicious content. The PDF structure itself does not contain readable content, but the presence of external URI heuristics and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 5

  • 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.
  • 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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a89df53fb4e---puduwawebego.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a0bf0d068bc4a219df1c23c95a03bfc/1583091605.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ce400753339396f7d3378178354575d5/misatatidipawix.pdfIn PDF document text
    • http://mesterek.net/tmp/53099608876.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d9210661edb41d1d1e8dd684b7939925/59495786819.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/27955332911.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877aceec620---zufes.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/35167077029.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a074ebee16a---95909372909.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/60779577245.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d20c635b---51054602319.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/71609898254.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f0c8628f---62819627866.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/17be53d9480f2bca133f2b54e8f0b660/34017695331.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/63997587463.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/25323242895.pdfIn PDF document text
    • http://tencanpowder.com/d/files/lobenedavimubufog.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/54685235269.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160daa724dde8d---40361462484.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/xusimalugagilepovadobud.pdfIn PDF document text
    • https://limsurdua.com/contents//files/tuzolovafiwolemidagasesaz.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/togewati.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fokudireja.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1004edaf9f---93491950505.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e3abf5f53a661017fb012baf4e6b9674/28865049668.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sulovatorugujidizitepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hcs12+microcontroller+and+embedded+systems+using+assembly+and+c+with+codewarriorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00032e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00034673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34673 20676 bytes
SHA-256: f68763b7c0da6cefcc2a3c8272b4b147d53bfb303732145d2136e84ea75637e3
font_02_sfnt_off00037d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37D5A 11420 bytes
SHA-256: 70a8faea7754666b46e2c6c4e0b020af32de9f568bbeb715b57cd59fa7ac3861

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