Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398846bf09ff2b8…

MALICIOUS

PDF

93.3 KB Created: 2021-07-17 18:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a4de35f5739a5d6a5baef3ee5b546fb SHA-1: 13ee265523441809ef3011fff167a3270c2fa06d SHA-256: a398846bf09ff2b84a2aab2ae910ba02fc3aef1c30b6c31b79e3c508b62a4c7e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The document functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious destinations. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://spamsmsgiare.com/media/ftp/file/9405797126.pdf In PDF document text
    • http://nw-line.ru/generic/uploaded/44174246916.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899982eb755---ruroxekibefinixikimiloje.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/996397631.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/lunaperipela.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/momefenedosikatalorume.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e222c0ca2bc---wewozazaxezesatunadog.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989e41ba1a6---kizukigere.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfc2b6ccf---63030687947.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/samomonafinuxakubojagomuv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9f6f6b674189aac132f4613de2f0c153/wukupolololosezojoj.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08630b0b2---bibikafuse.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa947370cf---zutufetijaselotuxutipe.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/r94kr1pctvt24kmn9rll59kkv5/fewuredabemebe.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/69e2ab0e9bb6caafd85f3590dc8c43bf/68479726407.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p3jcce00gfmrbqifs9kc3s7rep/94648721852.pdfIn PDF document text
    • http://elise.pe/images/file/wetulef.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tidupeta.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/80e9c56f0d86377127fb6d8eab7199fc/87767185733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=french+classes+in+kenyaPDF 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_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 10292 bytes
SHA-256: 927982292213eb79b873dd4a6b3c11e6e9b5a89a46cab51ecfee4fd9e38e3273
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 22860 bytes
SHA-256: 0f20bb24d576631a42e8b41914bdf3d654b7ad22620a1ed5c760f6936864cd8d
font_02_sfnt_off0001505e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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