Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e61b8b858e4f238…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 17:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e5b36731ddb1f2fcdab6d9ef1855e98 SHA-1: 1fc4ebc7ae3bdb47986733bdee7983a54917e1b3 SHA-256: 7e61b8b858e4f238f4dfc8162c5e65cadc2c4c0425cc9124d1ca4dc9f226befa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=can+you+facetime+non+iphone+users PDF link annotation
    • https://casaalu.com/luutru/files/90157661126.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42117070579.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304dc30bea---85531979707.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xenezigimoxik.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59ccf025f---81498304606.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab66d3f3bf---relogasafudifuxobaw.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/99854646013.pdfIn PDF document text
    • https://ekransamara.ru/files/38591113591.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/73817095789.pdfIn PDF document text
    • http://jfe.hk/userfiles/gegotuwonumu.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/detilomod.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916185518891.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/javibaxofijabodopuvetuber.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/7678664106.pdfIn PDF document text
    • http://ux-school.ru/files/files/27096904277.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d83e588---27594321267.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/xubevonosimoda.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/75993260879.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338de8dd7e1---diwim.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/fagifira.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/jevaxipu.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/zivuvukafisedadine.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/fefutinapejon.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/16941561770.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2081e6088fa3d9fe9e64ea88b7f1ce77/34524991002.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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10944 bytes
SHA-256: 38eb7bd236cd121c76eba7e56bd4e3f771adf07c4db207f753f88b4339f538c2
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 17560 bytes
SHA-256: d47fc4441b41fb4eccdfee50caf29e90e0ed2901ea0a42b24d26c44dd6a4c418

Open this report in the interactive analyzer, or submit your own file for analysis.