Malicious PDF — malware analysis report

Static analysis result for SHA-256 af062950a7f6871f…

MALICIOUS

PDF

107.2 KB Created: 2021-09-03 00:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 709bcba0c138e0f060a2bddf76f51cc2 SHA-1: 5dffbf7bb0b1f3417dd395010d7de193d85b9dd1 SHA-256: af062950a7f6871fd8ccc67d0d3187d0831cdb01764803c1bf1aa918bc1d9b28
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely to phishing pages or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=administracion+financiera+contemporanea+moyer+pdf+gratis PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc394e00c83---95412573924.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sagusowed.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/48a0fbc340daad174f532eba04f65300/wiranimetakijubuvip.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/90287953539.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/pajafevasugotinikiresa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ffd0fe330c29e05ab6e6f48c6ba97d97/subur.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/tokukokiratupukuk.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5ed7c70065e15ad84e7cb2691b61287c/vikewokejil.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3b64bab6---64082722751.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/fazarefut.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b8bac8bb357ee70d2206df3effcc300e/14313821734.pdfIn PDF document text
    • http://terminsk.by/pics/files/xiziwefogonufut.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f0137410eb876f0965c710156a202668/99310691819.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/kogig.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/73698047526.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l22i74lelurhmk7ge4uleect9g/fajet.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a590f3cc449---71061272491.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/zumoxedu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa25452a9e---riloxof.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/bugudabamagevorixirikov.pdfIn PDF document text
    • http://bscartridge.com/pic/82357547936.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dodowuxedagivinazefef.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_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 22216 bytes
SHA-256: ef6b25f8ca15187cbdf74310402c4c36a4d614dffcde62a4ed15bf8890cce071
font_02_sfnt_off00018536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18536 11012 bytes
SHA-256: 370eeecc31dac2dc8298d3c46bc2941350b14125846edda10b40a753aff6e4de

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