Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c756d7958a4e57e…

MALICIOUS

PDF

73.4 KB Created: 2021-07-18 08:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3e0b7241afeb0705c935e483d99cd0c7 SHA-1: f866faa2ba924313a9c62489de535aae23e497bd SHA-256: 4c756d7958a4e57e715ea37d80b4d6c5374d64ddd9d3a8a00b9ea99a9d0dfb4a
126 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. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3653

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://photo-preiss.com/upload_files/files/vifalogufalitibipiteku.pdf In PDF document text
    • https://smsenerji.com/resimler/files/sukisikes.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/92207988187.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6ec308213603e6b7918378f2a361c458/paxujekumuzum.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/80283872409.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2068fa79---kivorawapazujukijifosod.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/be3f3e63f3e37c18d7b33f3ee10dbadd/44928478184.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xisonajeratoxanurejufenud.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/35350565019.pdfIn PDF document text
    • https://eslms.com/userfiles/file/77961559662.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/1vu2m2lnsjotuq65gted7kv1bn/69816126684.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/denenegobudutedaxofu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/52ae807179b8cbb271a4661c8e264b33/raxeletaduvu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3132b9920---juwajinevonawevebe.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k07okalupir647nfglo7fdi3n1/kewune.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nazososabelawumes.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099477464163---65773105445.pdfIn PDF document text
    • http://usmleworkout.com/files/file/54698256002.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xutirejokejava.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/bikakigesepi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6e987f4cce94584223da290ef6d6cdcc/22853876563.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wiwenamosemujo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92516b8e12---663038066.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/5cdln3kp9h7pfvt6m9flpm1kt7/49675335057.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ecc379a---42224478987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=om+swami+a+million+thoughts+pdfPDF link annotation
    • 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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 10924 bytes
SHA-256: 3b8f1ba2edd26656fc568dbdbcd0f838f80bc446a744cb07fdb392428eccd4aa
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 16612 bytes
SHA-256: 0ecbc0e15d6d3de13fa528051cdcf0b7c9009451866d8e8e130dd9dda5cb2939
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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