Malicious PDF — malware analysis report

Static analysis result for SHA-256 984d5b3f342fee86…

MALICIOUS

PDF

101.2 KB Created: 2021-09-06 21:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93633cd121ea0d62ed756e69da581779 SHA-1: 4262996d2ad3accf3e3d2d1008c551cc9d2036a7 SHA-256: 984d5b3f342fee869f20c10ff06e604d54bf242f166794a4149c5411c447eaf2
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate it's likely part of a spearphishing campaign aiming to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3074

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://pixomot.ru/uplcv?utm_term=lakers+schedule+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096f13fe6082---85227524670.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0po43v7opsgnnb7r27pcad7vg2/xavevajasixajo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fa99e494---degegesewisuj.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/92737632973.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/332e77fd884787ceb67888e58d4736f7/pefude.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/10586604794.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/lirake.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/7441413734.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df30f6ae20d222b512341dcabcff01df/2095795403.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/tatorejozadapuvamekugas.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/relerobasavemuzafagopuzi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1rl7i7qt6ol77k1pnv9hnq1j83/sugobat.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/jufukup.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe253e5d2---kuripobobetituxili.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef208daf5---nilowigatorevomu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/900c9646ac5c3cd0122f157b4342c5c9/66056552076.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04bf68cdd---78727938359.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c74aef86---92934272174.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/lozunibexafirejusosabava.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5dca350087f0dddef0752bd83827c1dd/xebegipojefabixiwofi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a546f83ad8---pilidesul.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbe301587---lujomofuworup.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fffa8c06e84---94772513933.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/waduwigarizowiwipiduzalu.pdfIn 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_off00013039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 10452 bytes
SHA-256: d305adb8d70b1509d563d9fef3809ec8321d23e812c485ceccb328f12be0ac17
font_01_sfnt_off0001480e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480E 18408 bytes
SHA-256: ea4a66a406a269aa1fba54e344d94b82eb1331ba7dda340430c1bd3dbe091b6c
font_02_sfnt_off000177ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1