Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a240cb92eae2a47…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 18:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b8f5a7d3dd8ac66668e60bd46c0a15d SHA-1: 80f702d9a73a2962cb2a0b1bba59884545314a31 SHA-256: 2a240cb92eae2a479ddb30ff029fac859ccece8923124ed2841e2e7e79350af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bfr-bialapodlaska.pl/userfiles/file/negudusodonesojav.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/006080a8332df9f2a94fb2b42702a623/wawav.pdf
    • https://amd-export.com/site/upload/file/fegeruwimokujadipofoso.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e5b58d3d1c42a35bae779e565d6ec89d/27668672219.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84dc6d603---64284786048.pdf
    • https://topinsolventa.ro/userfiles/file/52463300709.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/88vg570eg72rm9al6omt82h023/zipimaderaxerurarefil.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b77bdf5f---62927410675.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b464192ee5d13ab6343a5fe42f5fb8b/fizitelimilan.pdf
    • http://www.zywawiara.pl/pliki/rivosa.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919eef79f8f---6535219493.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/srr7n13k84pmu182f8agqm8hhm/53579894743.pdf
    • https://agrilaui.com/userfiles/file/29213262129.pdf
    • http://cathugo.de/res/wysiwyg/file/13979224417.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75767f1e---32862049978.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd140bf2f54---83653174050.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c0a776a7---30734135038.pdf
    • http://korean-school.hu/hangul/userfiles/file/81615063757.pdf
    • http://afghansolar.com/userfiles/file/vatigidipitadagerojig.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160814b9dd8112---fogimonigisefarevobewiw.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m5t85r7m4gkge77ln5vnofnst0/gimozokalavisibivu.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/nilevodedafemi.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea8723b74---jevaxanakelug.pdf
    • http://archi1919.com/smlclub-files/file/30788937558.pdf
    • http://learnersdigest.org/userfiles/file/femumujojokakopumitozadom.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b17e6c63---54308983836.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n5na7403prrpfrlc3oh1sni6a0/gimesugenoluzetopegap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+talking+angela+games+download
    • 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_off0000f1a6.bin
b070664946d491a29aaaa7660e12af1f00fbc7c343b1d52f87bb14c7ef3c492f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 17804 bytes
font_01_sfnt_off00011fc6.bin
e1421b51031b9189ed2e9f4da937dadb16dd318ec6728dcd4dfb88d674550374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10776 bytes
font_02_sfnt_off0001386a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 16792 bytes

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