Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c00ab81f71f2877…

MALICIOUS

PDF

72.8 KB Created: 2021-09-22 19:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4e6c2ba0bd28e289efe011e92513584 SHA-1: 92f525692e2c5625f161e0d9a3473ab5015f22e3 SHA-256: 0c00ab81f71f2877051ddbbafd3155f6a82cb0877579aab78241da2757e651a6
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of external URLs and a visual download button. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download and execution of a secondary payload from one of the provided URLs. The document's structure as a link farm on potentially compromised or disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=cso+ppsspp+games+download PDF link annotation
    • http://turchifiltri.com/userfiles/files/pexinifanuzepawu.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/94397593225.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/25237947684.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050832229033.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wevirigosasuzo.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/33536079148.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/bibalex.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmd8fp13b6r1fhf4jgeut70tuo/76724965095.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/emep0ugp033hg0nlfkrifrjotm/67211871167.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c1a6cc47cfc3512bce200e00b65adccb/rugetamama.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/mifumexakawedonasewu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/76822204965.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/68305801099.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5194e4f---45283041821.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/88745754799.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad46b79f3---fozexalibijojitaligap.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/02d7173319b23bb957b763a606a556c3/94386949705.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/dofitad.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/71053139824.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/89345994524.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/38474870273.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/63837080316.pdfIn PDF document text
    • http://alcantara.cz/data/file/64211359062.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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 10564 bytes
SHA-256: 5234913d2ac8ded7172193027de08e972ee05275cc8e518d376561b9a0606358
font_01_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 17356 bytes
SHA-256: adce4ada668f743b7bf64b6fc5f24b1ccb2183901a5e76170ea37133cc76a4e0
font_02_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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