Malicious PDF — malware analysis report

Static analysis result for SHA-256 7586f3adae68666a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 02:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5c6dd832dea25dcc3821b843e102052 SHA-1: 8143826910b3af16847dd30e89526d464fb6529a SHA-256: 7586f3adae68666adc02a7666320301684a124cc067b244bb4d0c734bfdb1760
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://equimat-cheval.fr/file/90229635327.pdf In PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/78348666151.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/xafekunizemik.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/52304681360.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/tanevubuvafosutivelazet.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/95599984337.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/784d9aa5ee4f285a7f0a5fdf1de1b0f0/taletewavomed.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/nqjp353ls2keqolbec7cqqb3bf/xixogezekuvaruv.pdfIn PDF document text
    • http://93564497.com/userfiles/47162352082.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/e724a410c9rhmcag4l307kvlcc/65630741814.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ha68kr1r29of65tkk7fa7pikvv/jebipazamumube.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/87263988250.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bekarezele.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/66820962926.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61de2ca6---ruzuzumanulevifavumojaji.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2acc0fa2---52329179390.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/3a068bb33641650706bb0a70d35c3ceb/20490270624.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/didakurapukigikubojuwufa.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d09ebb775a8---subiwiva.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/detepubo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eadc17043---31132328058.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0c73836913af7c43327c58091e585358/vukogolibal.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/18920359316.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/57632393204.pdfIn PDF document text
    • http://ippon.lv/uploads/File/88462777127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=word+whizzle+answers+hiddenPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/69360162165.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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 17904 bytes
SHA-256: 8d93ffb6053366d52df7ac34e3772384fe0c424bf1e1334416233d4fad700127
font_01_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 10384 bytes
SHA-256: ef51a8c7635b760ce5b07f365a02c8556bc88492a174878a2ed3563fe686a99f

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