Malicious PDF — malware analysis report

Static analysis result for SHA-256 3473457444af1892…

MALICIOUS

PDF

78.9 KB Created: 2021-07-30 18:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c14b0ddbba7795b9bfae6a8fedd7750d SHA-1: e76e8b8b523f03b265ccbd4fc6f931e0fe1432e5 SHA-256: 3473457444af18924661ba1b747bdc0711e23b1638ebe0ec2969d8980c40455d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and the nature of the hosting suggest an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=programme+si7+bts+sio PDF link annotation
    • http://nirmalapublicschoolerumely.com/userfiles/file/nikojotisabolax.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061207305473499.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bdd59b5c---70237344733.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882323809ba---jefekilavo.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1b573d9453af89f492acf9c65d439eca/89516342952.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/bupadinodabarosejoj.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xelenulaf.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053baf015a---fowogidogifurozivoremo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4e60d69acc73f555c71b4d899e9e726b/nuxiwepawevunux.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/92083334659.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd47463a49e---9449204646.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/34484846994.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d914e892c---95358333258.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/tukuxewepas.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/85600927068.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xeturuvukuge.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607115ade66b7---66690000438.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d120cfc6---soril.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0700edd68c---guzuzigagebajesovewewuja.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mtgorl312680m5ii1vnhsvdd46/27513724177.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/dowizefowibisegisijuvov.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/81663009079.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44f522907---90141619903.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wunovenasuluwomaje.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_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 10492 bytes
SHA-256: 23af3e7b177e0852cc345149db4b4ecd486e9ed432f68924cc279a596810d931
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 16900 bytes
SHA-256: f78b25cc42f9a768bd6adf2962b87ea8fd804a65fea0248486cf8839d90ac86b
font_02_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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