Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f42f4fb60d02072…

MALICIOUS

PDF

91.4 KB Created: 2021-07-17 03:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8fe4b2ef36a037a1c6fbf16c624aaf5 SHA-1: f6dd10942e522c33429f1f2fe2763ae8def9fb68 SHA-256: 5f42f4fb60d020722c2e808ce7cad9682448b1809048744adaed3b2f20f4fca9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous URLs on various domains, some hosted on compromised WordPress sites, reinforces the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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
  • 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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/57c11bf316f3745f3ac0043acb7d1942/72064858580.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c5aae948---13249861040.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/50723582693.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/devisutazejuwegukagebumeg.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f04732f59---4567273198.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b2b327af9ce04b92a003539e470eb6fa/43401946977.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210612_273BABBEE30617D1.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/zerunajopemawiluw.pdfIn PDF document text
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/2329122565.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/31574263891.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160909cf051cf8---sufifujirasoxuxazisejodo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2174ee3bc6---57335276374.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/97333519259.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/399228d3e50dc4a47031362031a66923/vexiben.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/be91b6c30eae9c3b34062fb8a6be000a/bukenapidotage.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f62d8505f---beduferiralofuwetesomaja.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68029716561.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/db5fiv2cnll2o4gcodocqg9rmp/68868413755.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/piwawuwanefaxerexugofij.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/80a21998784b4d36b4caf1f8497ae8f1/10551976957.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/xenugajilosatuzu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a1ed83c6---38155690807.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7cb3c3438db02dda9e9a3d5f7ac5e70f/jezoxuropugikalekito.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc751722---35230175886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pink+pig+from+winnie+the+poohPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ea64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEA64 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 18424 bytes
SHA-256: 4ff21bb28c3e2017a25cafc00ae4da618d664369ee618a8994ab366c2be1021e
font_02_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DE 10608 bytes
SHA-256: a2a307fa03cdaf76cf8f8d33e11f2e439c53b0b9837ec255e30126de9ec80459

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