Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce1059266cdcce0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 00:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4db5e40beb6e09338db8528862a88aaf SHA-1: ecbcca51b8a70526345f161f7f314792fd458c0e SHA-256: 8ce1059266cdcce09bfd86ca24e63ee51fafce4e933e06adee1c5a57348152d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external PDFs hosted on various domains, suggesting it functions as a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of compromised or disposable hosting for distributing malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://devcons.org/uploads/userfiles/files/julunevuganixanan.pdf In PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/52179775770.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mazapizodotu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/df6d1afc20c81eef99fa74291e0ad8e8/54735317172.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/51c519404f502d26abf27c7ca286a1a6/bazimorefesonefibun.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/dujakekeluxazavo.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/vebod.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161260f305f09c---kujemowonub.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/47810945253.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/97c62cea8bbf922582485c4522b5b9f5/51812701637.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/koxezanedikadirekakepenod.pdfIn PDF document text
    • https://andrejc.si/files/file/serikitasuvirisanobu.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/zemovodubuwozijobilowuziv.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/81370703461.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea6d723182---vutasebulonitenogekej.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/mufideturagonurapo.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c426c1cf8---74758172005.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d26246f7c---18258250995.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d68b965ef2---wejazekikobesikojamobe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/8234556400.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f309f187---65478037034.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d2c87eb8---23047394221.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f841a929---70185766699.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/87530675420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=online+pdf+reader+printerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 10228 bytes
SHA-256: dd1323513c5fa0e96e64596e70edcb4fcd7d40bd753efb2f34e92bf3d2c6143a
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 17584 bytes
SHA-256: d73980b67f3bc59ea00be92d9de8cbef15bd6f20540f0ce2c7e2c71214e0ef61

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