Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c0f46385c94754…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 04:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d73045379d5f53ef393acb4f9fe414e9 SHA-1: b6b519e275453e03187c2f07405073914fdda2fc SHA-256: 62c0f46385c947542b53982dff295ebc3d260ac7f0bc9ab9027f96f759419ee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS upload storage and disposable domains, aiming to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xboxheerlen.nl/userfiles/file/15279961591.pdf In PDF document text
    • http://qazaqbanki.kz/data/content/files/favasakuziwu.pdfIn PDF document text
    • https://foulardfotografando.it/file/xunekopotobudegedijik.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/52289215686.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/13812081409.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/soluwek.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/puxojufivovaxoji.pdfIn PDF document text
    • http://veitali.com/upload/files/bimewexaraf.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147267414697---gogagewafogo.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/gagopogoxokepigixajes.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210908044925620.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/16373192116148717d9f20f.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492df15d595---xipoxezajodadusix.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/27911665192.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lopovemowitotikomemap.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/mopuwawez.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/18069711101.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/puguluzogudozegi.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/vamigovalu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b8cd6394d6f204c7d97852fac418c19d/timuxerojoriteta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+pokemon+sword+and+shield+gbaPDF 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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 19340 bytes
SHA-256: a6ce3acc9e0763a0b5fd39f06094c6797e988ba52a5860eefbfdc02bb90a1032
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 11060 bytes
SHA-256: 6a3d72ddf0043ba1fd160430a9fef669ed3966bb0b51a998077bb010878190f2

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