Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b16fab5bb22120…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 08:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3dbaca4e65301e1aaebc3a5cd123d6e SHA-1: 621782b4eaf348ff6e14a3a4b49f2a10d5b50574 SHA-256: c9b16fab5bb2212035aa8942c1b281901be96d07d2d7b7965077da04e8f520c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The PDF itself contains obfuscated content, but the heuristic firings strongly suggest its purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=omegle+camera+not+working+iphone PDF link annotation
    • https://zhbiotech.com/CKEdit/upload/files/fisodozifogomopit.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gebibuj.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lamozoparurevibija.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/64572390496.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/83474272259.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614291df5e5eb---zajigawinifunakedagavod.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/zosexenokijusikalagadape.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/1266150430.pdfIn PDF document text
    • http://cochemical.com/upload/files/diwabagisaleperiz.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q94s98ull4bvods7kjvu9i5qji/sozisopoxesa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uei46hfet79bbke77jnr7kg0nd/gejamapalifovuwi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/darilenesamedekesidajor.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130518f7ea44---goxotipimawiwixu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4c5362689373e0472faf792dd5e2f9f1/kojeziroromotolifesizuja.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/p9p9hu0af68i34s6cvvlrt4vj0/78243732442.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332e01e7aac---65540357059.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/xigezidepuwexo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bb0ce938---93322945471.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/dipazis.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/vinebezekokawi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/21265251847.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xuxozib.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/jaxasifegamupajorikamori.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_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10856 bytes
SHA-256: c688ebcc2b9e654b355e9e65c9a84ace86a12674b04c737566aee56e43ec55f8
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 18900 bytes
SHA-256: 184c3ef483b87b9f94bb54a769faf17dc20a8edb61c6ce6fd26b7022bf3144a7
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1