Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5186f8b35d8580…

MALICIOUS

PDF

94.8 KB Created: 2021-07-27 15:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b330ac608be2fad1c7735f12322db31 SHA-1: 742f4e456ef795d52cd2641c373d419623d05d9d SHA-256: de5186f8b35d85803ddece76480742e1806f37c4b4dab509c8804cea5b94960f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4782f6fafa---51008747960.pdf In PDF document text
    • http://seamacros.com/upload/file/familone.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f17ebe93---26582454076.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ukq72tsd76k85htir3b9qqfhv1/mixevugadefawuwon.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/40iu9cnlck5n11ue62oji93fae/womogazazek.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/ritagej.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sidami.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0c87a1a6---98632594232.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608631d4563be---68501798060.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/14247363934.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fd7e83d2bf5e97810b66a2c6f9ff327f/88675190527.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6404727d84f53502df76c678f7c3b5bb/vapigegipisusuwerexix.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0d5cf1693---pisezavugefinokoxad.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/7127876556.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/200b1a8450cbad8cb18cfefd1f0132cf/vavogomajuxexivijo.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98648038378.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16081d615a38ce---41182774079.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/93634418096.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e4cf86d76---todubaxulubax.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/84195826381.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4bmtvpt3qk38ba33ijgp0ru6f6/konujor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=find+saved+wifi+password+android+no+rootPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 17516 bytes
SHA-256: 1f696bcd900b575ad2e5357dad22484628680e518fce7013fabcbeff3d008513
font_01_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 10576 bytes
SHA-256: 34586764a7d970be5dc6655cacc6b268f673e8f54e0cfb097d77e76b8d832e21
font_03_sfnt_off00015719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf

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