Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec1d1c0797efc3c…

MALICIOUS

PDF

82.5 KB Created: 2021-08-27 08:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bd41d6aecc266584df39a965eeaa640 SHA-1: 82f13d06a029c08ee6b373f3f8cf1abe932880b9 SHA-256: 8ec1d1c0797efc3cae9f65fce8ceecc23d5035ed44d0883a70ca603c006ff49c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://okinawa4d.com/contents//files/48454688194.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d53b86b11b1---17810042191.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d5677cb555bf2e326a119d72492d375b/kapitojadoloxizapib.pdfIn PDF document text
    • http://peak-experience-japan.com/divazixupi.pdfIn PDF document text
    • https://tempegaring.com/contents//files/sujadojufuborojexeparu.pdfIn PDF document text
    • http://gptools.net/userfiles/file/95736742122.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/raketibopumupezime.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/tewasutotuwotu.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/37852816689.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d4bd1cd80ade85beab85761061a11a8b/remol.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/85763680075.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f37ejlmimehjt1l3t6dl3pco8e/paxadejomuxiz.pdfIn PDF document text
    • http://deauville.ru/files/file/nusazolizanujuxalagotovo.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/xajilosutefi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/59cb4467197365736c8c32d176ff3184/fafem.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31df2ec932---18191884355.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/suxiramodoxelegape.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/80990722467.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c51004eca24---24922677621.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/67967401117.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021822354577680.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d506992b169---44998775637.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d3602e29711dc5e38a169ff783af5f4a/dipik.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b82a8677d---96015843932.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/waroxiponuzo.pdfIn PDF document text
    • http://hydrem.ru/images/file/99492362007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+to+word+converter+by+onlinePDF 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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 17016 bytes
SHA-256: 84c274a29e7eeb8a936fab95d3227af854760192cef42e807494a970a8d8f154
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10544 bytes
SHA-256: 27652b1996189eef6cd6b37c7e26c86c0d29a4fc8d932980b90689421f2f8845