Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a7d36b48cf957d…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 05:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c480eaf9d448536789184ce783032e7 SHA-1: 90f8868933afde4447b0137f34ace9591b2097da SHA-256: a5a7d36b48cf957d8aa7063d773e424a9818cad10fe7d27b9cf9f8d82c0228fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad75a2da6---78928777338.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd559f58c---32353982205.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5145dcb89---lakedevakatujalixe.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585692ce3---64283962557.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/708c9e431a4c330794085ed5a8e50f73/tevepomevonigino.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/38827104965.pdf
    • http://consol.hu/images/uploadedimages/file/2035026583.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adff331dec8---venuwowewuratipe.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d6ea23bb0---jimuvawokapivugatimofaze.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cd009bcc---jijizunazuvubumobo.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6b823d42---pojizag.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1822b288a47b6531bdd0b5a2539f02a3/49781939012.pdf
    • http://abpaluso.com/upload/file/84802617237.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cf9e88f0fa4746624a18a1d90f368185/45174205815.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efcc1e341a---28116841381.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0b6d8c23bc94082efc8057a4938137b4/11364021497.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3a1b1acc89432f764a29734503589bad/tixisejidokap.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0b8dc2f8fa586e9bade10e8a9dc8264e/lopozesiz.pdf
    • http://ondrejkocar.cz/img/file/24660954030.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160729a837f6f8---padasulujogexedidus.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/14292103059.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9986016d---10629580757.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=boa+constrictor+blood
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e276.bin
21b126e44f97d1b56e2ffe75b59e5b60e92fa3f4128a7e33ab3d2f03a3a9df3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 18216 bytes
font_01_sfnt_off0001117f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16792 bytes
font_02_sfnt_off00012996.bin
a61a41b5876e71640b6230ed4bddd059e4b19c0f29d8ff313ec0cca3cdeff3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 10424 bytes

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