Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adb7162b5e794f4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 07:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 301f21e3dadc71631fe690fffd987c43 SHA-1: 8e81d45e367c704c6b7f77741b3ea7fcc4507610 SHA-256: 5adb7162b5e794f4c61d80b4bcb13ff6a168a69e67221a4357eadb497ba7dcc9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a download button lure further supports this malicious workflow.

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a0da4ffb---jetibari.pdf In PDF document text
    • http://littlefreddieking.com/clients/65037/File/56578201003.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5a6e0ad25152da355314a6158688b109/telazoxoxovamesigilodos.pdfIn PDF document text
    • http://htcable.cn/d/files/98537525674.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/j81uat2hhkdl97q3c4t36eb090/88813659457.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/50431825928.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e185ff081bc232ee9ffea79bfafc69af/kapawepamitaja.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/mijuw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/436cb401bcddb63bbc5097cd54b9a125/52395961149.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zuxojobevuviwativ.pdfIn PDF document text
    • http://iltorg.ru/upload/file/nidetirimagaperi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/35115594155.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/lirigezu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea7a00d66c---29001692469.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/33895704327.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/lewavekabewivuvasu.pdfIn PDF document text
    • http://artside.org/data/temp/file/makovigafiwovimoteguvoleg.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a305fd6673c9c02b03021bf52754c7f8/wanulikumoburofusi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/37028402172.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/12785258546.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/25140378013.pdfIn PDF document text
    • http://insei.eu/userfiles/files/vibifelexowibifi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/23df0ea2950a8cf55b425fa044dd7e6c/xisosuzowirarel.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988f8e0b6dc---xakuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=national+old+age+pension+schemePDF link annotation
    • http://irodori.kir.jp/files/file/98208092687.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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 10836 bytes
SHA-256: 9eff928177c06a10befdc82136485960b7bbf5b8becf036644d83e2aa47dbefd
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 18248 bytes
SHA-256: e89f567af6fa05dbf5b981f4591edb891cf33416939b7c933cee21574376645a