Malicious PDF — malware analysis report

Static analysis result for SHA-256 f563f201e8ac2c0c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 00:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf8fe57a09a2f090f0b22323ee0a3852 SHA-1: b304bdbfe20132c995e97b2276dfa3ce53d8c14a SHA-256: f563f201e8ac2c0c86d7a670f8e12134eb0ac7a81025d0fb1f2d24294a63104d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b979cbfa37---57628629356.pdf In PDF document text
    • http://a-swiss.com/upload/userfiles/file/72751054542.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28f3629b2---2423862806.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff7f492bc---rogifetalonuworazomisito.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/walasapatopupax.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b46934a5---sutadazepomisagibakefox.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/59794808585.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/80333004073.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/guwezenibajufo.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/43d8e59d86de2b09d4a9b7b3300612cb/busiwanadivun.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xamalozobesafuwavasu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/38675997773.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/fenurofimivodifur.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/3704090168.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/folozemewekak.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/25795e05f44e26cfd257df033b543148/gotumidesada.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/91863505476.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/tirupet.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98253827f---majamemaxigifovipa.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokitu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210821062000.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7d76876a---97802841430.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/51707136747.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f8ffaae7615e5d418bfc0be045016686/vuvepikup.pdfIn PDF document text
    • https://polaria.cz/images/file/pobeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2015+subaru+wrx+manual+reviewPDF 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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 10876 bytes
SHA-256: fe3b4e95d96f7b87721cce51d7bb4b9a9655c7df01ecfde09c79a7087e43f452
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 17196 bytes
SHA-256: e3d07140a7fdeb593c542dc0b6c15712eac7dd1f987b525199cb0bf42ed6fbe2

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