Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65458c607c072b3…

MALICIOUS

PDF

95.6 KB Created: 2021-06-27 08:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 523c788eeb40245c9e155b5f1be21074 SHA-1: 6afb3696f6752e446bff082071008bb17f2d92b2 SHA-256: e65458c607c072b353a1060a44727c1efc4fc9178e5ed7d36fab489c7f2509df
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/882fe4723a4eb03c96346015272f1622/24033951745.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4d2ee54b---80309887576.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b980508becc---murozofapexedetaxu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/75c857f66e7ae24f3404115d2c2e6c97/tipokesuturize.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/96230503031.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/61210479919.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/dijoxefozogagatefixelama.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becb3670dac---zakenisuwi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/feparasulunomofusufe.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rf7pe11vcnm6kf55p9eglvo332/dogufipuroguxigijemal.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/33099251640.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec91bb68db---96082484286.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/xepilemodapofodogopa.pdfIn PDF document text
    • http://unseretochter.ch/images/file/42405389008.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/nulekenoxi.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/risasarikole.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af27a24b45---31456248693.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/mulumijixabovijiku.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46727592f5.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077fddb39e59---93010527721.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/101482629660a80fac47405.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/goliju.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/95596537946.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703432882e3---52644867069.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90f6cb97b---nulevivapijagirozuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=modification+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 10816 bytes
SHA-256: bb6ef184d1ec66f8a0d645818e14856e91754db6159b2aeac4977a72e984fa53
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 19160 bytes
SHA-256: f309042f2e56693bc4871c0e07e49397c6135d96daa4af17b9462a48d5efca03
font_03_sfnt_off0001572c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572C 16720 bytes
SHA-256: 3a6ccbe924e6050da22cbf7c8b2d692b957791f508fb15aecd07e0ff5cf2bc1d

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