Malicious PDF — malware analysis report

Static analysis result for SHA-256 1183fa36cd023ccb…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 11:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c90cacc1dd438c061d0efb513d28bea0 SHA-1: 0e142435112b05910b17ba53ae38ffc811369bc1 SHA-256: 1183fa36cd023ccb41d151322537d799e72665845e1d59bed2267ad7a154bd6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking and potentially downloading further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=how+did+the+first+car+look+like PDF link annotation
    • https://binarbaid.com/public_html/userfiles/file/fuvekubuxodixetige.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4dbd20eb9---bazelur.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/48710963938.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108062225538605.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/fixujebejixenevix.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/xibatemivufivi.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/migifubabibejifirewekadib.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/t333mbmkelhfr6g4dnbqj4n386/96633689441.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0618edc36dcbf237494bb26dddfc94b7/75862408473.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac6b2574b---tiwusibowesuleg.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/17729055911.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/np0ujkcegrt7r5i67pk8d4g8t9/mosokoguzakifa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a4517c2e7---37254648627.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zilur.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/48764365646.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121caa350c6b---gokulizofudebugexapes.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/43963420863.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/tisusiguzurorumoxewimovol.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/binukurijupefi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608877c776d47---1786015667.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2589eb1665---61340948190.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210731225606_1625212404.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/96613406775.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/xudajadusanevibu.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/bavunovotovo.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 18880 bytes
SHA-256: 173aac059e719eb25d0cbb42162cb1b1b42c1f54999fec76073b4ac6dbcd1463
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 10636 bytes
SHA-256: 85185c557959c81a1201b4fa52964242051ec27ba068cc10ce85b5ccb4c07e3e

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