Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef065d66a4b70c…

MALICIOUS

PDF

90.1 KB Created: 2021-05-23 14:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c109f73f91266d1307f034fa54eed1d SHA-1: 09458a44dd2888ae79ba142cd1eb052cdf8eccea SHA-256: 27ef065d66a4b70c7aedb0cc8b880041b3185f10823ba9f6383d9a3b5d358445
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, many of which host other PDFs, indicating a link farm designed to distribute malicious content. The presence of multiple PDF files hosted on compromised CMS upload directories suggests a phishing or scam campaign aiming to trick users into downloading further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7961

Heuristics 5

  • 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
  • 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.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b880de6d---18941861841.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7535ded3a36d1c5a6010893dfcc420b5/polijezupurupuguwagalo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070406861f3c---22702338567.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tunudosogep.pdfIn PDF document text
    • https://mfdesign.hu/files/file/6943649648.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a1f03f6eccaccc0d0e74259c6c4a4b39/28749024802.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748440c429d---zudixunebaxina.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/n6qlno6bo4agra2t3pavt5ejm0/sipegulosazukuf.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848c7b95a29---86428340210.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/69fe7f31e9248ee02e4a8706ff5ccfac/32544395082.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff7fe13ee---68696909645.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/e507309b4fa4d706c88263d6373acf44/83650643112.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1964fc1b79---57669682037.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/83808718322.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874ddd5b92e---ludadomedupowipofe.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/piwisizavijamuwigisagoli.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a3bcbf5ce584c2c750d966ec4d947e7a/lavuwaxofudorero.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/30561036550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pylint+unable+to+import+djangoPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 10184 bytes
SHA-256: f50a62538ed013bc72c4436fb789b67a986a5545b4e811d7bfee4da959190b49
font_01_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 5420 bytes
SHA-256: 3372661bacbac1bbf779ebf2e7f316f7886bfa4717ed26db0319700fa1e02ac9
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 5812 bytes
SHA-256: fa247e9491aac1432c91c180878f427ef73ded25ad89d54458983d337774434f
font_03_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 11860 bytes
SHA-256: 8d3cd422b17eed19a2ae8a07e5f28dd848ab943c6a2c353a0da977cba4c2f8e1