Malicious PDF — malware analysis report

Static analysis result for SHA-256 c998ab209150d7f3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 07:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc1b4063c1d8c6897f2012d092a2aad3 SHA-1: dec9c89b3a021950cf4b2efa253d038bd0575414 SHA-256: c998ab209150d7f312cfdf7d05e24bb1ea57a63ac9298262b11948a311008af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the 'listing presentation template pdf' UTM term further support a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://cathugo.de/res/wysiwyg/file/wixujiwugapani.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/pofotiradazo.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/25477392239.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97297162423.pdfIn PDF document text
    • http://614move.com/clients/4890/File/47373651270.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/pesolegotujegagexik.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/29676984147.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/81045165365.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b491808122---bonexoroj.pdfIn PDF document text
    • http://ijpdua.com/contents//files/34535734912.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/pavedimovuse.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/matitirodogunabipagevo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebc37caa7---84662798303.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/76250967023.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/58a8b69b25f38de2ae04c8b689cb3149/bapirafevoxa.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/03c37d3c2125e9961ce731cb601cdb7e/rojuzefezugutosufap.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aea4bba5858---dapepebefuf.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf5da81e33---niwalofupenafifumim.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b3b09286a---10104312737.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/25053843066.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac19886f2---74768482306.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b897b9aa73---jemarutibula.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb67b0d83b---66643487802.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/kujigapowefuvebasemuregas.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/dakivalusovimatogapigenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=listing+presentation+template+pdfPDF 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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 17468 bytes
SHA-256: 08573b26d7f2553c749999bd82c0efd31bcfe15155c8313c69195e6fba3e9ae5
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 10796 bytes
SHA-256: e242a6f7772da3ef9a1cc30d66d0f986340c71cc99121575f01314edf30c3cdb