Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25669b8718b67ad…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 14:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 215b0559a286747108691a0d1d9942db SHA-1: cae3c9ce171b9ef4fa2dda1153cecca40dd26a0a SHA-256: c25669b8718b67adafbdd578f09467515b59b8501f59be1061b65ec50c2e2e32
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=red+hat+linux+tutorial+for+beginners+pdf PDF link annotation
    • http://mywayrtk.info/userfiles/file/funuzitutexazejegivi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/57024800552.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/87731805703.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/najuzofibuzozepefuseduv.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93f48a0bf---10676030708.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pesureravegobiritezaw.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/witelizigivopuzefalulafap.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/63680649725.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/wusefu.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/1666567604.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609838ca5c662---67459883600.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bfb2tflndpmbjf5mio73d2mfs4/31248741046.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/456989266.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/jaragoxeved.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/76258725466.pdfIn PDF document text
    • https://edarky.net/data/file/werelalogulif.pdfIn PDF document text
    • http://korytnica.net/data/files/15486740504.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a5d5c318811b77aa475a9fdaccd7528/dopudegalisopisipotuga.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xarujosigapu.pdfIn PDF document text
    • http://kmsenior.org/file/files/49997054873.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/47144033231.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/732f8e845c639db635dfb2b68fb9a8c2/46190746096.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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 11164 bytes
SHA-256: b700d885a7edcc2a275616c836f7153e76e5f1e8b2b571a0af66a652dff1dbd2
font_02_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 17220 bytes
SHA-256: 8ecf6acd558d9836dca2b8df0d70471a751b406707fba9f525391d150481166c