Malicious PDF — malware analysis report

Static analysis result for SHA-256 2953536a8b99337a…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 20:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 365eec48fa6471297fa9c7b230597f9b SHA-1: 49dcb96954082eba6c4e217cb4e828c3256ff290 SHA-256: 2953536a8b99337a2d7a18ca35aba5e06e9c07adc8e38a8ac8f392f8abf648f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=job+interview+questions+and+answers+why+should+we+hire+you PDF link annotation
    • https://nslogisticservice.com/userfiles/files/79947173372.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/68810533296.pdfIn PDF document text
    • https://wineart.online/userfiles/file/gizanam.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e37f6ad713fb099155c92e86681a2ab/63245550931.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jemorumufexixox.pdfIn PDF document text
    • https://masihpt1.com/contents//files/14339493734.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050221553673499.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a413559b94---kamukajewavota.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a21465417bf---46216201917.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e57d825aa---juvewevoso.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c099f2c0f---kifexodimaburis.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd2c55e88---bumumilisesakatogem.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/9218448754.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501023241980086.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/45496846680.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06ef49a909a69dcd83e36ae0378b112d/203304613.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a950a54ee---48892131844.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/83047411218.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/bajawofuzavet.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f1f11326---92551061934.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/83591399791.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a17d30078---50719316071.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/fag3paorbe0qms1pb3o06i0obo/85422589266.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_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10988 bytes
SHA-256: 3ec657505cc343ca002e9e6c59c4f84c82e3746756ed2f025d9c121160f12a48
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16548 bytes
SHA-256: 46239a432120d2728e9a95d03dc4aa93a6a55467dc03593fef146e213d7f47b7
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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