Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8c27857b736fb0…

MALICIOUS

PDF

72.6 KB Created: 2021-10-02 14:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7a2d11e34448fe95539b76427d948d63 SHA-1: 95dfa25f705469b85473e4f5e0323bedb285d7fd SHA-256: 5d8c27857b736fb04107d289ad3ccdeb7c0520046ba03e22bf110e9e44581d7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to drive traffic to these malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=meaning+for+philanthropist PDF link annotation
    • http://omni-links.com/images/blog/file/nutapifewagizaruvupe.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/45186582647.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/sesekukive.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/23972768583.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210930/file/33742575461.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/29543414225.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/35e61916d6c851140d38138ae4ff4fe4/muvofubapolase.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156dac46acb8---mitowomibupatuvupo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/78174129662.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/82995888093.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/80697f3b219439b77c2b1ba2d1356261/xikidifuwamupizerufe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca3bb5aef---wulox.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/zedanewin.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/44528224682.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16309469522064576297.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/rurubupukuridafisuse.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/domov.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/98549574381.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/lalilujapupikej.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/sefilibo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/jumifidarek.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4d8bc275b454fe69e7eb08035bcc92d4/belavut.pdfIn PDF document text
    • https://geloracinta.com/contents/files/10163131143.pdfIn PDF document text
    • http://turatabor.hu/media/nekifobegubiduxokufo.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/45773221234.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_off0000b7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CD 17316 bytes
SHA-256: bedbad0a78a3dc42d9097663ea005fd54fca929dd165131121e7f9a6518fa9be
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10632 bytes
SHA-256: ad50a390f1ddccd779b2f19d65e835193a99a6e623c16cd37497ad8b3af1fc73
font_02_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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