Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eca2d0a590f1cd…

MALICIOUS

PDF

122.8 KB Created: 2021-06-25 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 578b6b59a48df3e06a23964748c3d1fb SHA-1: dc73366d0efde9a9c2c981087aa3321e4988a170 SHA-256: 40eca2d0a590f1cd246239d56698eb682afe37dddc4ff2838024b57006c5d77b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest a malicious document intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b966fb71823---82005683928.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/6772526190.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210613224805705.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f0ec31c4---19654437500.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/52bb7fddfc69775b1791319ae87af7b4/58646955603.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5nk4dnga7h3q3omr38vs5kf1j2/vesiwinowawokiwexuwegize.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cd4598f681861427a3ea4c687155263b/gukosumu.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/75952260920.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/54808350418.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/afc4f38badcfec294a02cc7ef893b9db/bidubodovojakejegu.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/xokutuxubejigepi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24ee13d12---90645725846.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/6057714058.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/misizejiboroz.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/mijuvegetudugozaked.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/01a7d0369d1ae2a4053a16495d385452/bepik.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609504f3c3b57---tawutopapisegamoxetixu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9195cba3a---81769798224.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/pigawabozavovafimun.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aaa90b26e35a4cbc6d50986ce4ad069f/gojupeloduruselajutaret.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vuvipozesaxaxeni.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/76400515327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=design+of+doubly+reinforced+beam+by+limit+state+method+examplePDF 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_off000181d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D8 16028 bytes
SHA-256: 0d811eb93b202c450d92522b2e702bfab2840820bcaa60b7f9f1ef43480d7508
font_01_sfnt_off0001aacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2E3 11524 bytes
SHA-256: 2d419acbc3ce731a3a0f0454fc453fe32d8a17c6365d473eb1ae66401b815eb2

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