Malicious PDF — malware analysis report

Static analysis result for SHA-256 818fb854e408852b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 07:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24d4ae18b8248afab7f7f370cbefd333 SHA-1: 3567272fc050693ab12c5f8651d951c946b06905 SHA-256: 818fb854e408852b6842b7761b81b259a020bb28761408a3ae09f3925aecd691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=inherited+traits+worksheet+3rd+grade PDF link annotation
    • http://newcityhk.com/userfiles/46547273248.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245961615c4---madivetowibozo.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/98972322619.pdfIn PDF document text
    • https://langumeistras.lt/i/File/54488413105.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e6c1ce4d---sesug.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g3sn25cqp0mbcvkvo6u95l0ii4/fiwirenevemoxipudu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/93cfdbaebe348c8a3f675f4cb588f017/58126124109.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612507cc757e8---19995475504.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/peninuba.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/memisatefivexaduvin.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/8334088768.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0c4629f31177b225a6fb9c989a093fb6/83866713184.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d4e8d40cc2b7cf10df330c8341f4b077/vanitodojimodabam.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fbae6d27a525ea789dbfff268b85814/kuvawopuzufej.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d86393da---gifopadarijedevofirotizi.pdfIn PDF document text
    • http://marketingnews.fr/images/file/26462643943.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/fakofolebudulupulira.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/rureregaxev.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosepuxuloxupataruvijaroz.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/tebudedizeninafudifiwonuf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21f5ce54a---41358515303.pdfIn PDF document text
    • https://adikketiga.com/contents//files/kapafugo.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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 18380 bytes
SHA-256: ea41c8532c5e630e90880de1fa65c2898a1069631bd180b9b52d9973048be434
font_01_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A8 10780 bytes
SHA-256: 9f17828ebfbd1a9e9276e977f8e71d849ea83ac53fbba939ca2ebef3cdcaa6d4

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