Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4bcefbf5dacf54…

MALICIOUS

PDF

85.8 KB Created: 2021-08-23 11:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdeaf373e9ec6bfcb57e1c3f18fef263 SHA-1: f6605fe57c6400ec9935ba787f5081430999d6d1 SHA-256: 1c4bcefbf5dacf543cce9f502ab7065a72a76a7c0d93e5ed7c3c7c4c983f3e79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of link farms used for SEO manipulation or phishing. The PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://shriramsteels.in/public/ckfinder/userfiles/files/45279860504.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa58367ed7---duwivu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/nosebebegawapuliza.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tg4q1mm4soio0p3ur8lqv9ml69/rinaxigirov.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb08e9f46c---1350805122.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25926f4fd---75796278674.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sezekilipezivar.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0a8229e7cea05b0b72dc8300330cf958/34906745030.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/fumalovaxilinux.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecaf51edd---vavipikufewajemuverezuge.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bf1dc03ea3013f104ecf942dc34f0f61/21806390534.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614021651.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/20376710737.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3235a3e3f9---nudebubedimafofuk.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072beb9080b1---25194735441.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/tiruvugifiweve.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/marinakotolavasib.pdfIn PDF document text
    • https://togeltop.net/contents/files/78292156634.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nuwame.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/85069225345.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9a2871424f734fe2b6bf1753659f6314/3726458913.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/34992467783.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/21665347600.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b4c76f55f---taxenobavipokafidimosimix.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210706193312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=multivariable+linear+regression+modelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16980 bytes
SHA-256: 964bbb8ecf83e9d3807730ba260814f0c5b189f53ca24dfbbe0e264c1523c2e9
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 10892 bytes
SHA-256: f2ed0ef9561d014530e1f250fe3905723fadda8ba98c0fbd1e0e551b5f0ad919
font_03_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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