Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1fbfb679bb15de…

MALICIOUS

PDF

73.4 KB Created: 2021-06-28 16:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8b0437d56dc769b0e3168d9a0b67e7e1 SHA-1: 302a6814146e8a9ee1082531d387e5f5471a80de SHA-256: 0d1fbfb679bb15de54b71b6af1ee0a1d1e0f3086ee55a0e948012ed5b23d7674
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and the nature of the hosting suggest an attempt to lure users to malicious sites.

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://allytemp.ru/uplcv?utm_term=by+far+meaning PDF link annotation
    • https://stalbeckers.nl/userfiles/image/file/53578984282.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/88721502570.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/80412329336.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57865cc275---lejufotosinolugex.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/3994842311.pdfIn PDF document text
    • http://apsons.eu/files/file/72255889318.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3886a34f---65998362345.pdfIn PDF document text
    • https://andrejc.si/files/file/42386638821.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/86241278998.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j1886uhlmrj8vc0k2u7hjtoula/38534029039.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e3d4012e---24989885123.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820138342f6---58934912626.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/muwatakipetovosaxuvola.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d981be42733---zobipitegevidotibipuf.pdfIn PDF document text
    • https://petala.gr/userfiles/file/71328569839.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/j10kta7u17iejko7ebs4nfmen9/12720314123.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/fawamivilavi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pefafixom.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52425daac96269be791b98b4900fc90f/54267867698.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/49525719240.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/rosanijugigipidowi.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/52692202605.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098527687d7e---zeramagorimefifulojonujef.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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 10292 bytes
SHA-256: b0b5743a5f36a7589e51374833e7a400ff2432612f2b697f998f779f83684bd2
font_01_sfnt_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16128 bytes
SHA-256: 8316895fc451b437ad13c4225a02c3593b07dce5bd1fdc9643a97c107ffeacc3