Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0633752f98d6b4…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 01:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 729e22095dcab8a2dfc13903f5b081ee SHA-1: a346a0a1354b8f34f243673a68e79401ada45f4d SHA-256: 0b0633752f98d6b4e5dcc55ed610b2f7cc3fdb0efd124417f3f779011ab3c248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/50af4f38ffce9137ef8e5b205f4335d8/difusa.pdf In PDF document text
    • https://kawanmto.org/contents//files/13536259153.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/94917558224.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/89649af647f579982d37dfd63e04cac8/27827638354.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/tewafovetojuwemax.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/18772450024.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/re257out4vllnodl1ud78002l1/verosinekix.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/89185301900.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766ffc6a445---61360157598.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abf83c3e0---82095993436.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e8a78366c04734663fdf8a73d5b59676/68323169806.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef4bc45c1---29831853206.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdfIn PDF document text
    • http://flomojapan.com/upload/files/8209388450.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a037895242d---loburofikelumegenitudek.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/59535809031.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/50b026ae15277a8d40622e1c507b77cd/sivoxusajorunabezafimaxuv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0fd189867---lenud.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/99643676838.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2650ad4435---96185883489.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/kiwuludiwij.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/73366987605.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886177a60ce---71475777261.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/23914924948.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/gomubiminupabaminix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=preview+mac+insert+image+pdfPDF 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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 18192 bytes
SHA-256: 38531597ca1630c1febcec532946972808b37fc819ea0809cf0d5cec75bd2281
font_02_sfnt_off00014e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E44 10952 bytes
SHA-256: 18a67466e3ba01d0368794ca8540be013a4993f7ceb158614bec56e371eae451