Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fd4552c2c97c6d…

MALICIOUS

PDF

78.8 KB Created: 2021-07-14 08:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d118a10574a7e48214b45f480feb0dc6 SHA-1: 7a6f4b79fb461c4bc04dfcbc552d50be9334deb3 SHA-256: f5fd4552c2c97c6d24a39e80ca97d14e409d5b46ae0aecd3f8c32b10496b49a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or hosting malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://masihpt1.com/contents//files/lukudexi.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/408165e47f182f0b71a755f1bcf9b0e8/razefarusawetuvofab.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/2570350274.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd0808db9---76941459352.pdfIn PDF document text
    • http://biomisszio.hu/tmp/22205795796.pdfIn PDF document text
    • https://heyratacademy.ir/file/galiporulinadogaxagu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608470e9b02ee---memefakebuvoxam.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc37622242---19429031126.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7703b01b---zulekaxekipupil.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/47608369912.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/dizogajotiga.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927048600b5---85571208110.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/14496157064.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/47627525386.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/muxolimepipaf.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/98623557322.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/17a684931705f87dc021efbbee20b2d5/batukonazumefat.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b541ac33---21292658474.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rofosuzar.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/86458353204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+princess+bride+study+guide+questions+and+answersPDF 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_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 17208 bytes
SHA-256: 9d7b7ee173fbe67a5119c3a365b851bdefec037691870fb8a3e0e54e459ebaa5
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 11296 bytes
SHA-256: 3707b61dd32051db37e73de6c7fc1eca4136c678b5a70f33fc7134db09676d76

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