Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebdd4503d0262d3…

MALICIOUS

PDF

69.6 KB Created: 2021-07-10 00:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1bc72ef45be1fd9832698b2466ddc5ce SHA-1: 1dcccfa5895f3a3749849c0cbffc49bf7986e8f0 SHA-256: 0ebdd4503d0262d336c79c8109a02578e0daaeba35a1d16cd30fd453656832cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. The primary function appears to be acting as a link farm to distribute or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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://nolimitscenter.be/peausitive/images/FCKeditor/file/danilafivavobunu.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/87r8p0j6in1oed1o8sgd2tikpf/gitarigulinowi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecddee6796---mamubep.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jf2i3vfl4sdu8t11bc5s02llb5/jubetitubijuzitogub.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b40b87508---fonupojonu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/40232819166.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/88320164474.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3nde1d3ekqoothf8ce2to9lsma/pekibavu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/67860753799.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160727aa69de5f---zepogev.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/77636934563.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/988ba79fe828d4aa1513cdaeab458fca/31583400429.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/67048400484.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a883547e47d---zejadarelarijasikiza.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ln9hsrvcpvbmh9fusrolas93c2/40756075376.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7afl3psea9o5303hfd164vbshb/63538240882.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092622957c10---naxawupalekatevama.pdfIn PDF document text
    • https://netpage.info/userfiles/file/fofejijozuduweji.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c17faa12f3692586ecdc1313a0028c4f/subewozaxutovagowoku.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wowolavokem.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ahi26p1lskfll49c1u4qgi9gs3/wogadejijegobabavegalivo.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/31942519556.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/ninimawiwivizizadebud.pdfIn PDF document text
    • https://lecachet.fr/docs/files/gaxuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jquery+select+last+childPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 14764 bytes
SHA-256: 3bc386fe746c3fa8adfb6fa60a04872278200f4e401447e44a28afa2bf43c407
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 10596 bytes
SHA-256: ff186ce59dcca94754a081e7c24f123dfacd1a090e79739739288bb0d9d3cb7c