Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b646d6f56b6141…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 02:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 722cbb3b38485970e3d38dabc0c622d0 SHA-1: 1fb580f46928d244e87a254d660ce8d614b55341 SHA-256: 40b646d6f56b61415c974a6bc579a8d44171c8b1756af194cb38e7906d2e679b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to various URLs hosted on potentially compromised websites. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier flagging it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://postele-z-masivu.sk/ckfinder/userfiles/files/zidemipebalog.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9c1bd36302d65e30bc2fc23f95f5d46b/bapovilejoluzala.pdf
    • https://testgit.begurholidays.com/uploads/userfiles/files/guvat.pdf
    • https://studiecarriere.it/uploads/file/44617570127.pdf
    • http://annabarons.com/files/files/26185692102.pdf
    • https://sogelec-eng.com/files/ckfinder/files/12478585345.pdf
    • http://cadelupo.it/userfiles/files/muxepubigamuper.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c54aeca04f6f20a376830cd7a63417e3/52429310481.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/rugutimupexaduzudiwe.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a4150401---wimub.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/53791853164.pdf
    • http://lovesenergy.com/file/37925255283.pdf
    • http://askort.pl/Upload/file/4442037664.pdf
    • https://unicon-msk.ru/data/files/76672580959.pdf
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdf
    • https://12shio3.com/contents/files/fukudosibesu.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109071819202991.pdf
    • http://indemo.pl/Image/files/76496346987.pdf
    • http://abworder.com/uploads/files/sijudepaxofola.pdf
    • https://red-adlay.com/upload/files/72517856351.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+anime+dub+apk
    • 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_off0000dd33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
font_01_sfnt_off0000f545.bin
4502ac5ae68fd1ef0e8e848ada9e48d40421415f6d722d020be369445481fd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 17996 bytes
font_02_sfnt_off00012460.bin
315332c311941918e887d06c81292c7989389a422044913a45ef2dd2c3e3cff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 10672 bytes

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