Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ed3a388f4a59f…

MALICIOUS

PDF

105.8 KB Created: 2021-07-04 09:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1dfa633c3f2d0ae335757544de6d2ac5 SHA-1: 8adb26c66463dfd33224bcb2669cc64b12c6018e SHA-256: a55ed3a388f4a59f8ccf5a847fdd93c3207c64fbb9431a308d0b8821bead9a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://motacademy.it/file/sixaroxanuleselivifudojip.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/o5o2artijmsfu6odknda3jmj6k/jiwobuduv.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fd7f2ba706c3d2d38cc70366170b4e33/83122360982.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/45741921365.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad891206b---jizomezubazatadorej.pdfIn PDF document text
    • https://seerupit.dk/assens/file/genixasitadosigewizili.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v3qajvp5du8957hbitaj4kba61/782305817.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee004d22b---28067833816.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33889046843.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/laviwox.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/vafometusemuvusufigeru.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a181642f---balorelejoxerorunan.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/29218934340.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/denebekemosatenezil.pdfIn PDF document text
    • https://kede.org/userfiles/file/rosuki.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/29186162655.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b1425a334---lixonon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609450cae0f29---semidotogiji.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///77718263492.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/7926269477.pdfIn PDF document text
    • https://promise-land.com/upload/file/53633293060.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/8998342766.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3dc90b998---63987451862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+heal+a+bee+sting+on+footPDF 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_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 10612 bytes
SHA-256: 52a55286f10c09406bbb054afe06232d3051a9516409a26862f3190644cc0b9f
font_01_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 17540 bytes
SHA-256: 6739da452c0f91a92fe9b07fd6b0b6d7aa6ee69e49e3966fc97e94b662c47882
font_02_sfnt_off000181e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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