Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d73db07f4e5ba4…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 04:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bd04ac19829225c20453990e74a02f7c SHA-1: 729a78c943b602ea3578e4fa779952aef5b1fd88 SHA-256: 73d73db07f4e5ba4395c4116191430a5054160434ab3ca7f1d98c9bbc64bcd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the primary attack pattern is the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=top+one+earning+app PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d77dba9c150d6c30661fec28ccc12cd3/gudipisab.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e41f3bafbba5f476467b7609f674b5f/tupogozolowojez.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d2a48ca0---94892997521.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/htju8lo4bvl8cfd87lqgdd0s4o/24973624592.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/bevogosibiwativigoka.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/51997725505.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083df527e850---38246246632.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/89401191327.pdfIn PDF document text
    • https://marosme.ro/hirek/file/37997223043.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/dosimelegefiduka.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/tujajiloniviniteket.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e06d0d55---68958089595.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d09e8519d10730d2ae2cb645fd6b7dd7/sivozumoge.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/usa4jh13s291trlt302636ai4f/289372808.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9aad1b0d---86564557246.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f84c918cc13b837684d150c1b9b3df0/kubekawujosevexozuzopo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v7mrs4giuse3tjptc12romsfjs/jigodofepuwabaf.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bd9343d3---siwixubonedidipiro.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/pesudegofizesob.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/88363206685.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/zabifunubegemogunaju.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ede453b01---5259983620.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/714sb2vtglfn9a493ji3tjthpm/18191908781.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8e7a48f023e762d06907414f091b7be7/lurev.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/silizimepuku.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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 17652 bytes
SHA-256: a6400d90358649b907c139cf7ec969a24b666674398b30a4d4e8df42b702f88c
font_01_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10076 bytes
SHA-256: 0fd63fbfa462d130e088fe6e6e5a49d8e9f966955b33e69a53131edf65ad3b7d
font_02_sfnt_off00013399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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