Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa81538adb4a3681…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 00:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb942a09fbc92f98ab654958f894ab69 SHA-1: d5ae7c3f3bff17f0a92d13d433b2c757f8da5ba1 SHA-256: fa81538adb4a368121a5d952af701ade58745daabec14018cfb35d6f2c3e948e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bbe1d632---kuparegupaxesidodenibo.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ac9b7b05ff1861f35246be5e54f7743a/galinifufi.pdf
    • http://atek-ent.com/upload/file/zumomarunefagogudaw.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ff5197e15f27a299876693ff9dd90cba/sojituzasafakorazifosakog.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2b6333a6---51199649718.pdf
    • https://drvishweshwari.in/userfiles/file/5357893026.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/72ld31s9q95c5nj1tdf1hdo935/fabukixo.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/45f40b160621bd46be8e519a10f347b9/61017960233.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9621bd8b92ba5415d9ff7874fedbaa9e/momaganenowaw.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02a57a77f---tuxirulasigusagerogevevuf.pdf
    • http://skupka23.ru/upload/m/vokilatiperaben.pdf
    • https://questyme.com/userfiles/file/teberojitetafogujesakekam.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/gidefasonep.pdf
    • https://ludifrance.fr/userfiles/file/85619671737.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k9i3nm421buhi38bgkt4hc6pj4/tenej.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/cf2754871559b7d7a96ff820aaaa2205/fenizowemefefazegob.pdf
    • http://posekatzahradu.cz/files/file/45257479825.pdf
    • http://gayaarchi.com/userfiles/file/20210521130510.pdf
    • http://duetsepolno.pl/userfiles/file/15932972685.pdf
    • https://deesudcoolingtower.com/userfiles/file/50001709184.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7290786afe---19147386813.pdf
    • http://imssp.by/data/images/fxeditor/file/16597310907.pdf
    • http://filtrydokoparek.pl/img/all/liwogafiwo.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80f38d76b---94319668304.pdf
    • http://ippon.lv/uploads/File/gugumetaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=xnxx+full+movie+download
    • 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_off0000ed38.bin
cb7a882339a700513e7fc9dbbe01ab1584d25dff4aa16b40a02457a71c9ff5d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10512 bytes
font_01_sfnt_off0001051d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 16792 bytes
font_02_sfnt_off00011d2f.bin
25cb70a796a3c220df3018aa4e5d1eea4233524ee4b63e125e0f7c6d28be01e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 18252 bytes