Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c73b1ee735f894…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 12:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f13376d9e1ca407d36bcc248bac8ee12 SHA-1: 64ecaee7df297c24e096f48a39dfe99cda7418f2 SHA-256: a1c73b1ee735f894c50ab5bfc34198fcb0846822dbb747c635269c24a4b30212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=teoria+de+marjory+gordon+pdf PDF link annotation
    • http://yasaitogo.com/uploads/files/78547627302.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/411098703e0bbd7553a4594f92a1cda5/nozotenekuwosaj.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/58fe7e8493e467c875c181e638b56c79/zaxafuwogavudonuvibe.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/vinadev.pdfIn PDF document text
    • https://memoservicesrl.it/file/86878662055.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e73c2a8120f61c92f9c1b88ec11aad61/fonusinuxawotalosel.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/tazuvimamo.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/vesix.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/dikulukovovokekip.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e6375f85ff54871268b13bca78403363/30895865818.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/zupapege.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a858e1038ca727851f948e300998f835/35799925581.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/15336421795.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pasapepogaf.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6a62e74ecd440a487abd19d0d4ef63c6/sisenasijig.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc437415b---wusizotabor.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/ribitejadorasefes.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/ganakijofezupofasid.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b388b830fe3---tojozeni.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd344dee732---pilobotimuruwabelarajaseb.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/df17e63d2e9f458bdad1506995326835/14265974280.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0717aa204b---96786180716.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 10736 bytes
SHA-256: 347f1b48e943c8658089474355d0207a48f706fff3a9fa3b7f3e90a58a9d972c
font_02_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16272 bytes
SHA-256: 1b919fae46306f465f943cf0208514e6ffd773c23633ff91cf875186baaf5e5b

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