Malicious PDF — malware analysis report

Static analysis result for SHA-256 41492e395ece435a…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 22:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9c88d43700d08e5a7a9d73f2cf7534b SHA-1: 7462cf70fc40747aedf7f2e0a76ce1e602acb518 SHA-256: 41492e395ece435a56e5093a99c39912ccfa58992803d04bb159bf6d15d3bf11
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://paklya.su/design/img/upload/file/zoxomelerijexafi.pdf In PDF document text
    • http://fouladsazanco.com/Upload/file/nobas.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fujlpe6orvn6smoc4lm8it3div/85526587509.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9650b1cb6---27326748375.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210602155412.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wogirag.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ab6afd6b---vipirudamutexenumo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/96650702618.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e23225fe8---seneduxava.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pesat.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fde54277---35369516352.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37379922e---14437785534.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b841cd69b0---72872472379.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/82964345578.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210630_434E2EB7F821ACD5.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gijodulakaxaviladevu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/5925985521.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6ec0a87d8963b78ed965ff2f57e7f0c0/80876765730.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/44012338485.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802b938be92---2664852515.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dikumizapofelekejojileb.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3aadca6d---31821254010.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05adc3fd45---10171063614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+get+a+copy+of+my+citizenship+certificatePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/sujomerobe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16744 bytes
SHA-256: 50ede11892f18ba1a89a66c17c8b56c6d6d1ae5f12739195c6481fde2aafe9df
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 11132 bytes
SHA-256: 52869e703f9ff3d71c7988eaf6e2b00dce47f49195f6f35931be5a96ba89882a
font_03_sfnt_off0001473c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473C 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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