Malicious PDF — malware analysis report

Static analysis result for SHA-256 23377f6f1a3b311f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 23:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6b4237b365d10d255b10758b06c7ad7 SHA-1: a41028ed2224691494cb73465fc6df16bb75d07d SHA-256: 23377f6f1a3b311f5ea1ac316c29ff584019c44cecba1ea18dbf42c484c39b33
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=linear+differential+equation+questions+and+answers+pdf PDF link annotation
    • http://www.thaiboat.net/image/upload/File/tepobal.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160830d098fd4b---vawofubero.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/bawujifukoj.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/tujikasetexafe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ap5g2tvdpk8o9ls54bbip1fpbs/83618733842.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/2999742739.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4b128cf80d31b59c0bc91b91fb2383e1/logovikebopuzunuvoki.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/16353052553.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608793c551344---32314521664.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/mitilodeladowetem.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vp788bu03hvhngdn64fq9sell3/xusigasikamufawoweparezi.pdfIn PDF document text
    • https://soechi.com/userfiles/file/56988475242.pdfIn PDF document text
    • https://atiksigorta.com/files/83907632637.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/78253577175.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/gepajuzipolirez.pdfIn PDF document text
    • http://emeat.ru/var/files/desisidigeposipug.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/sejuvuvipibok.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/vafagonagazijarikosom.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0feba32e843d8bf4f4bc98def7a253d2/kisebelawupufokimujatubup.pdfIn PDF document text
    • http://mopron.ru/upload/files/vixisodigakipowuxisurovit.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/runene.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/20498001044.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9961cddc---ripok.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lejixirifasotulabid.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/65335938748.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/ribamurexefoj.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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10780 bytes
SHA-256: 43515a0485248f68345e1c45416c5ef810f2b73eb269988b1a6997116bfbf3dc
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 17396 bytes
SHA-256: 3ac82a08c09cd190e7cff6847bc54e6542e93ed1f65e0eb28ab79b32ef832d0c

Open this report in the interactive analyzer, or submit your own file for analysis.