Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a86207261fa7aa2…

MALICIOUS

PDF

97.8 KB Created: 2021-06-28 08:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a8b141d8816a33323242f119c551b72f SHA-1: 20517b13df7cbb9f7ecd87913321edf27b4bba1c SHA-256: 1a86207261fa7aa269cb7db0d1ac88ecd9871657facdf97f6d3b7730bfc80811
156 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. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, specifically WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting an attempt to obscure the final malicious destination. The presence of multiple links to compromised WordPress uploads suggests a tactic to host malicious content or redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/9868cc3a6ce6f118b64b339b62a18570/38436276902.pdf In PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/83200441587.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokaluxokesexujinanofinuj.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/80513dd94696cf04937dea33f3e511ca/fazulewoxigu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/muvut.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vapupemuxusawemekofujelud.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/59941621511.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/49332755460.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c8420c6662e4eba96b95b93ada305960/polumeti.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6daf3809aa9e8186e94b03c95908234b/tiduviri.pdfIn PDF document text
    • https://inifd.london/uploads/file/67280580165.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0808f00a0d---xajafakukojok.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315eaacedd---37210829083.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/90023968146.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12e1920aa---rixubukopo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0152e469b1---sikatatabekezudowaxek.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8d25ed1a---sijapujunotiselezifajiwa.pdfIn PDF document text
    • http://esistore.de/userfiles/file/15887700242.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/45049364345.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb547843c---39455727339.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160712130b7843---perepezusog.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210609233706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+striders+by+ak+ramanujan+summaryPDF 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_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 10888 bytes
SHA-256: 51e22c201e1a76a8330f3095f5c728896d46c8d3827999ba0fb0035565ba5ec9
font_01_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B34 18560 bytes
SHA-256: 0c274d73a9613594c3f5a1c7ed92721d4dd092f3c33c86741c17b36241ee71aa

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