Malicious PDF — malware analysis report

Static analysis result for SHA-256 b695b4cf92336f01…

MALICIOUS

PDF

79.5 KB Created: 2021-06-28 15:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 69cebc46940f4f0429cf611b5478b0fb SHA-1: c2d91ca17fd42c8cc32300de979c7e79bd9d3233 SHA-256: b695b4cf92336f018e08bb6954dcf54c5c0fe70176aa23a0f8d1c22ed03bb427
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of external URIs and link farms suggests an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://altaprecision.com/userfiles/file/nudojifiluxese.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8dcf3fdca7f30a66326228eee0d66215/besirosuzi.pdfIn PDF document text
    • http://medica-brno.com/files/daxuxudilurexi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a80ec85611033988755950f79bb6783f/pexiledovodawuz.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/bukuzanabonogu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/75ca4fd35f2c0608747dfab6159b9d69/96472020489.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zisakagunukedopit.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734f6bb02a---wimolatazapezopota.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/zufatititalivuwemeka.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g7r97cm6fgii17hqcmkg4vsklp/52279157679.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/28531338508.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c488d31cfd7---sadipulilujax.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/10d2494af1b8601f55c22bdf4e0e13b8/62003039391.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ad9ba4d5---roforawuxotupedilonur.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b042e1446e---xexinamejobi.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/rikezunowugodepatiri.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ba4c3b96---likeg.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/xoxobigu.pdfIn PDF document text
    • https://ovalpolycoats.com/media/42029870604.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792aa2c2c83---logabupufavupesot.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/dukojupevinovurajekefa.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607637d13ba22---3318540194.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b81196af08b---69772215271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=oxycodone+with+foodPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/36120166577fea2954e60fc0a4c4500f/36274500227.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 16944 bytes
SHA-256: 1f6f6775d121cb9feb00bf4478c5f75d41f6dc4dd30078fd009abf3fb4e8c5ed
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 10424 bytes
SHA-256: e21676bd352cedc5f882f12fdebef39eb636d3f673e69717946415adcfa25cab
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1