Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f4d3eb11e7ba95…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 04:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94756370e754d8b80221a5b0f42059db SHA-1: 6a0f3c2c3a9e72eddf46db3d3ac00e58f23cedb9 SHA-256: f3f4d3eb11e7ba95b8f6b0fdda0db756de949ffe7a89d14ac39038a005a7484a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, reinforcing the focus on the embedded URLs as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=digraph+ch+worksheets+pdf PDF link annotation
    • https://festival.bg/fckeditorfiles/file/64043386947.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/078ca40734dccd0ced3d61b5572a2204/fofatufozamidebedeju.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/65454176610.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/28730546390.pdfIn PDF document text
    • http://nfc.soo.jp/file/40770388918.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28979120244.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/juranutelev.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b03178fa391586e1cebd6f71c06f7906/mugigasid.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/61683413963.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/jumamapugon.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3ada6fba---fagusatotol.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210819_081047.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/56231188640.pdfIn PDF document text
    • http://abnicum.com/files/file/melod.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/romijufunelino.pdfIn PDF document text
    • http://placc.info/up_image/perurigekiwafij.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080151a79a61---85315153806.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/98047335761.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc740781993---23885213377.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/14891593829.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/83e28f2cac2cb2c14cc2589ec53cd8a3/gimajiwonuweteximez.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/008aad7fc253c7a844a9592b33f50260/xumusopuvexopana.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/45330975397.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/29957860356.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/10513128455.pdfIn PDF document text
    • 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 17424 bytes
SHA-256: 56e8a4408d4c902dce97234100e329975613de57090be3b5af0ad50ef739ff7f
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10928 bytes
SHA-256: 4dc043586e95cc78ec213df59ce4335c9d47c277458d9633159cdf7949a5de78
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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