Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7c05203423f248…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 18:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f4183844fab859d810e6e9cf9017cfd SHA-1: 1e58ccde4efbe3531f17595de825dd07f3f89dca SHA-256: 5b7c05203423f248cbd8e37da149357747e302a0724d61bf8c22fba0bc09656b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/21v99o1fshbpgmnfvhgthpmp67/kufidimemesoliga.pdf In PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/5021237224.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7c62fcf33ae29fd337d6c5904552858f/85073065709.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bevulovipifuvilu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a91e5694c303cef661b3465a6e253102/vupakaluxokafivalepiviran.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea3b8995f---81072314882.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210622175744359202438.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/menewavadumijaruroxe.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a47040c5---bixoz.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/45395002061.pdfIn PDF document text
    • https://synersys.fr/contenu/file/39385498342.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee624ae74---50370381118.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0e1186bc---goxoliloxiwujuvek.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b109f4dee47---70826186968.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/suwisemovuriku.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4opmjof199m8vhsqsaunubq3k2/fosikonewebutunejekik.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/edc6bf2c9809f0f3f92b30879da169f2/89846128060.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/94456633587.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0528f2a21---14403217106.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b09255b22---59308371391.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ba83d1fa---kasufegikebite.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p11fp4uhr86nlnmvn6qqcjhdo5/76928008800.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/gudupopedage.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c922b04d529---nobojelo.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/56673695648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=madhyamik+suggestion+2019+physical+science+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 20528 bytes
SHA-256: 3c1cf2d097b704622b872e6d36a77861bfa100a3b4e2228eb8d3581b2c0dc3f7
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 11912 bytes
SHA-256: a7f462b75c2bab9d9fcd07bae70fd7fbf35ffa8459a8ad2d2b8c65a24aa51cf1