Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb7b6dfee2276f…

MALICIOUS

PDF

84.1 KB Created: 2021-07-13 17:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d211d1da03c0202db1c1626f22c6845f SHA-1: 49427bd9a7f0d9e6d75786125939ea178d11ad84 SHA-256: 53cb7b6dfee2276fd66ae5d6cc07e692137c155d16d9bc83b5d6aebc777ae85e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files, many hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crownprolaw.cn/userfiles/Proj_Name//files/29652875459.pdf In PDF document text
    • https://golf-tout-terrain.com/publish/page/file/24933830587.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zivamabumivi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/316e67b417c1e0f307581205d9af42a6/41531149159.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1ine4lpmvkprmte2sns69u0bf2/43471089771.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ef65deea---pijasimumugik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160816bd74e591---jenokavawa.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/76500376963.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d2429605---97627482969.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/35283643988.pdfIn PDF document text
    • https://gilbertems.com/videos/file/xubujokosupumitagi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9mom77hptpv3erv5pnu3dtokv2/vadezo.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/44747866642.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d3ca1ae8---jodibe.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb7448c1---10604920540.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c57633837---minufujopeminosisedawixa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/61d3811f41e0585d5c40d648421439b8/35034256214.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pobara.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3e6de5f1---voxima.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/bexowaxisivatimoxoramal.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c637b68cd26---57943041371.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44bde9e8a---xazavenuruxugatovixabiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=insta+story+and+video+downloadPDF 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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 17052 bytes
SHA-256: 7dede6846f3fd40215c7cac1023fe62364f69a577ab343a5608e6a35b6a8f35c
font_02_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 10460 bytes
SHA-256: 39aa0fe987762811dc1bf5a6b1fd8dbd701342712c863668a6600c81169df193

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