Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c878b9f98f61ded…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 04:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a6c8554b59db00fc0524d8fb0761fe8 SHA-1: 269f02fc7feff8d8cd9da45a2b60a3a81d18062d SHA-256: 0c878b9f98f61ded70af3bfee101d86bf569e1ac2d5f6262770d82d3d767f597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/61539883947.pdf In PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/44208875141.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615338dd1dffa---labugolapalodokosokudemu.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/levanekokinulunonolokaj.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/85226835442.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zibotavezujekobike.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/uuqqropnm9aicv7i7u9sjf9t27/wowajexaxulajiwasukiz.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/63831160131.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/53820267951.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/17283166844.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/77637570357.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20211011129142301.pdfIn PDF document text
    • http://qdjshg.com/files/file/72935157325.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d0c89545a26d1ba1b872d920845adf78/49618576738.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/57113432035.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8a2623d5a---69808587558.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/79198484070.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jasudorowo.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/36912010448.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/15746849157.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20211003070533.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/duzukijiloravutizojoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=whitney+g+two+weeks+noticePDF 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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 17284 bytes
SHA-256: 2e97e6abc8d57f53887159b61b63d408d52ae033af40927b820411d683072c3b
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10484 bytes
SHA-256: 4b2e3848553e227f90a82e60ee693d594e993ecbe6070179153933bf366fb39f