Malicious PDF — malware analysis report

Static analysis result for SHA-256 568bec3dc340a85e…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 07:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 452cd76ff3241918b2180907e26fd38c SHA-1: e4861942a7a4f2e8a0789de42e4ef9f5c1b5999c SHA-256: 568bec3dc340a85e6c1eeecaecfecdf296466cca9d53250dda28c67341604098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and link farms, suggesting it's designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/374cb93b4e6218cf4a26018047f7bbdf/64700003641.pdf
    • http://arqing.es/ckfinder/userfiles/files/99617953708.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/59316646397.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724bd400738---78179416786.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987f85f2f5---49544531510.pdf
    • http://bjbtrh.com/files/pic/file/gopasosi.pdf
    • http://nakatka.com/files/file/64365369306.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/40d34f56002f330fd99c04857cf10a86/31255347459.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b86227b54---bivokapumor.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jofifekixol.pdf
    • https://kitapkapla.com/upload/ckfinder/files/tepofig.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a704cca279d---zobifesaxolegavikaku.pdf
    • https://majorsagilekvaros.hu/uploads/file/wajomewafakiwudulug.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171760131c---21288489918.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092094b3da2b---56565859011.pdf
    • https://rybczewice.pl/userfiles/file/46327803320.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e513aa495---27058819759.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c948c1431da---giwovixasujutafupu.pdf
    • http://agiusfuneraldirectors.com/files/file/78973581514.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b41a3bc8---96817008399.pdf
    • http://nct-vn.com/userfiles/file/katidadumojimesepepux.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a13f3df8---gakozirokeferabikumaxote.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lqftvg6djram1435hdmpf11fuo/42960953022.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=geography+trivia+questions+and+answers+for+adults
    • 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_off0000eb6b.bin
388bbe8517073e58d9c49ecd44ffc743c1d1ffa876d837991bd19d0b45265932
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11328 bytes
font_01_sfnt_off0001059e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
font_02_sfnt_off00011db0.bin
32b05e875264b21a58bf3a76e563c641a02a242285c5fe08b276fdc7d64929dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 17396 bytes