Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc6692ab24f23f…

MALICIOUS

PDF

110.6 KB Created: 2021-07-06 19:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ace7c16ce6d255d362b204fbd14e437 SHA-1: b294fb93f48bc94d93f4427d246845ced82466f0 SHA-256: 55bc6692ab24f23f7fcab660ca74b96cec39e45e503d762d19e42e02a4771c98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 https://irlanc.ru/uplcv?utm_term=a+horse+and+two+goats+full+text+pdf PDF link annotation
    • https://cornwallstaffagency.com/userfiles/file/zoxiwis.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/nilifolaxurep.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/favotumi.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gadamajokaxevetavo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h7jopnecdoh19li21f6qao6mq4/jeworuwa.pdfIn PDF document text
    • https://aokman-drive.com/d/files/33513561809.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6868910aa6909700c5b8d2b67a27b0d6/29787518520.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/20178bb7fc2b042cf4eecf26744487cc/mabuxatu.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujexifaxololurodixiwiku.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8203ce2---bojewezajivapex.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1b471b64---lufusofamanomemovosore.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210604_204955.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/69678374565.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e12a74af6ff---92336039680.pdfIn PDF document text
    • http://hncastlecable.com/d/files/guwurapofapiw.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bigebamodilupofebogiw.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9b7da610ad7bb2ab78f99498c11fc410/rererumekapuwipasu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a8495b22---mananemuku.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/24162523574.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63816542d2---tevawozoduj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e58c4209f---fofibivibuvivi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d69e27820---34742450903.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e311492a2---xevuxesodudedinimida.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c98769ce8f3c757fe1d08ed65e037af6/14189320606.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_off00014eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFF 17148 bytes
SHA-256: 508419e6e1ff7b6409a425c9173d73f1cc7b8d68b9f4cbf9bc02432ad00cacc0
font_01_sfnt_off00017b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B70 10952 bytes
SHA-256: 2979efa9a32b72f9f944a3a9c147fa2648706a4554df1715c753bf755458f7d4
font_02_sfnt_off000194bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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