Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b66a906e43a86e3…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 14:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e053e519e3659742c1a88eaeb9146ea4 SHA-1: b4e1b44d11c2491b54c3537073af6114878c9257 SHA-256: 3b66a906e43a86e367d8d3bb421771673718c2a2befe1721793150879194de80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coretry.ru/uplcv?utm_term=hatred+in+my+heart+quotes
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fe2eb0ca8e7f63830df82cc52937c541/ferofemopoxariwitu.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xopesafowerumakiro.pdf
    • http://generale-bureautique.fr/gdb/files/file/jusidafopadofexemiginopij.pdf
    • http://jnnycc.org/userfiles/file/wobiketotutidukotemaxuxo.pdf
    • http://nandeestationery.com/userfiles/files/vesutukoge.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210616163155.pdf
    • https://aravlicraft.com/cmsCart//upload/file/gaxitefovukebazasotazamo.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/aapn5bei5vl3oumajvs7lhnkf5/zebovaxo.pdf
    • http://aklond.com/UploadFilesfile///2021050519324669.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528160416736064.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b10a9009---18950889752.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/33bbrsbf23rcknnddgnal60uf7/tebesunozoz.pdf
    • http://wildpflanzen-planung.de/file/78066811258.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2c054f80---3128838905.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/dafb3c5b6cf22b2786616860c5b3d7bc/rumetariza.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7a3o0hrmr09qh1gpe893u01ba1/guxizizejaba.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac13982b---28141989468.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/22b2c0c72f1cf9f12f70d1dea3dd3182/mininotiraxoxujiveren.pdf
    • 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_off0000e882.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
font_01_sfnt_off00010094.bin
4b38a7339d6de2a3c1a159961d17ca340e3790d4c324298207595efea11d6ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 18028 bytes
font_02_sfnt_off00012fb0.bin
b6e6848f1ec5b74507ec45eabb462e842761bafede4b27c9507d11db07f16c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 10816 bytes

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