Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf8b4427e33b9b1…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 21:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5242b6bdcd1f213bb69d88c837588eb SHA-1: d015e90c9d2a2f0adedae860b919c9f7cd544e40 SHA-256: dbf8b4427e33b9b1e61da04320ac51c142c39bc79ba37caf3294a7891dc38d21
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, likely to distribute malware. The presence of a visual download button further supports a phishing or social engineering lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 http://re-view.online/fckFiles/file/95872772511.pdf
    • https://maintogelonline.info/contents//files/90802668158.pdf
    • https://wecareu.net/ckfinder/userfiles/files/navutoxefudike.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/osomphmd2ev7ftjp56ll2v6j7i/wusanon.pdf
    • http://kinel-hunter.ru/upfiles/file/jikumojulesojunata.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/coffrn578inf4tkhcka0mj87f7/41526518426.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbbb3c996---75640566686.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb13bc90e7---puxulawezaxejogajepek.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aea80bcf0---64651800445.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6id0d2i72002cuea2o52nmp3q9/nefogozegegudegafizowufuf.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6b9c70bd01d68c99f779bc894aebbe04/11042879110.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfa31aa32---17130595219.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/163aae3457fc8c7f5abc31e2f56c025b/45307274813.pdf
    • http://domeinbeverdonk.be/assets/files/file/9742774900.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/30113f2666021bbfad31e05ba822601f/68575596638.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860cf0b88cd---rodibitetuwuzivuji.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1584819c8---13862409859.pdf
    • https://mamo-tato.ro/userfiles/file/10318854983.pdf
    • http://creative-format.com/upload/editor/files/481464033.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082101bca2f9---sidozesad.pdf
    • https://mahae.hu/files/files/25501066106.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072da218e2e2---6309493525.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7529dd3bad---fixesutesimuzomozodizero.pdf
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210730094401.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gun+shooting+games+offline+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e919.bin
92800ee6b12c21521d5677ae88f732012b1ad2af922dddfebeace6bece7cf803
pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 11076 bytes
font_01_sfnt_off00010294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
font_02_sfnt_off00011aa6.bin
e9877c6426535e9ad82fea11556e686e2c74c8ba2ffab00cd396026c84977f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 17980 bytes