Malicious PDF — malware analysis report

Static analysis result for SHA-256 445671cbf0e2454b…

MALICIOUS

PDF

97.9 KB Created: 2021-07-24 19:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1dd08b2d7bfeead4df3758a55d549761 SHA-1: b8f9221956859d13201fa770c9ecd71d86ac9689 SHA-256: 445671cbf0e2454b45f2d8a97a409caabaaa6cdf54064b71be432ce88d6850ef
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. These links predominantly point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF itself does not contain readable content, but its structure and embedded links strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160899fa8793d3---tajibaras.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a53167d63---82347547208.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5731c73c4a---47498268096.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1627063240.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd63a194e---milopefekinakebikozodajo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/spvtgd2jrnidnnk2is2u2qlss2/24218302369.pdfIn PDF document text
    • http://bdn10.cz/files/file/tomofamano.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f17b6475---vixoje.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ol5ls9u6j8aksqc25oho7hrv98/15415423686.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8h74sn13fpndv33pgre00v71q2/muxujuxasubugu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9a53ce76c251640f48b880d202a02b25/rukatuwajagiwotu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0932db1cd5---75026302473.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2ba64b29---15779749994.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/41a03cb905466a471078e1867e059558/89025680077.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/14370552370.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaddbcaed---bunorawegazuro.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7oah4fq0q6s1bnel7h2dm271dv/musovusi.pdfIn PDF document text
    • https://angkalaris.com/contents//files/49745220735.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/negetusifet.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wanidowip.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/50162275407.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/45554948685.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb0c5cf31---37703308873.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eebeb1b22---29977635077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=%C2%BFqu%C3%A9+tipos+de+manchas+en+la+piel+existenPDF 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_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 18516 bytes
SHA-256: c3ce38501d2d107bc86da82aa5fd1ab17ce11c81d2d00d81c5c60fae15ab58f0
font_01_sfnt_off00014606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1D 11236 bytes
SHA-256: 005c14013dfd0b45a8d182ab3dc9e0a9194161ed9c493acec25d3715db49be10

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