Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd5341efdde5ffa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 05:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1460f4ffcad55f89080d2cee27dce2f5 SHA-1: 0ef906fe2b2b3fcfda037224fbd13aac4dddbd94 SHA-256: 8fd5341efdde5ffa40d5d7fa09444f6c98ff58219447cbec23a304a3d3be6c2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sushiloverca.com/uploads/files/59277335592.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/8ffa46q7k2msn6ksvovcea042l/20314487519.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/47840700860.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/95621824841.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/26006669249.pdfIn PDF document text
    • http://centronegozi.com/public/razuzafivewatedufagix.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094698d8bc63---49143824477.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9d1eo0k5pfkihtrn4o78rq84s9/10231423991.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/komivopevadusebafaxa.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zipabubagusafezamojuk.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/54684518021.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tatawapumelematowowaj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/81016056316.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/fusejodafilu.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/zowoz.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/sutixuduwifar.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dedabesegonewijul.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kq6hhlfri9fefrgkfcin3cso70/marizaletumibokare.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/22090959910.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/71065197465.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/ledukisupefuwekuwuwo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1f3eabb1---pesemetujixafigi.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/95400663304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=normal+and+abnormal+constituents+of+urine+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_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 17592 bytes
SHA-256: 390b6ff5ddb4ac445a878a7a896bfd15bda9b5877c2e43a7b370b19c1c057d4a
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10996 bytes
SHA-256: 4e689392d362919a59da47ecbeeec5353f9b6bcc3cc2006083f9069201d1db22

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