Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3489c92af6de39…

MALICIOUS

PDF

82.4 KB Created: 2021-07-30 02:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5df0286aba9250b4f2833c4a922487d4 SHA-1: d37c78b359b64a298c6961d6d3d344b0cfebcac4 SHA-256: 6b3489c92af6de3981c292ccc8566a3b2f0232e749022686335469fc25c172e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://chcial.ru/uplcv?utm_term=what%27s+another+word+for+promised+land PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rolagexipasokofukedev.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/digivipunekitojipeparumak.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/71041745647.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9de2c742---79120753427.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/01/22131574597.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee51050b50e---13302427515.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/sidiwuki.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/79ace48cd5ddb63fbb4e77acdc681b30/temotafipaveseluxalunas.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2b526cf9e88f64a4c8763c7ff836ed54/20149827060.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/7719170416.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a82eab03710---mebedafurulopabizigipur.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d73c6fe0dd4bb0a340b61eaad23c8dd6/belutorajojofojexiwaf.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/taveremafakorosemewubum.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a3189a2c8c1b3c5f69f8ee356d93f125/lenunavuxalekixipanoses.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/zulexaluvaligugexodubis.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/38509740528.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/88b4d99d796071a978061918389f4050/44704805435.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/69931955911.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/48083019153.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/fageriludaputixazopo.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/kelilebulogaf.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf38cb5f64---6701754160.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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 10876 bytes
SHA-256: 5bcc914df68773a7c990a4d84da7f2a1d870ca33bbfbb86b3e5520782924b67d
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 17832 bytes
SHA-256: 0cd180b362b768dbe908d7448af83815fbf986c007c252c63e1b9d6a39bb2f24

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