Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2898dfdfe4c04f…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f259c41dfbc711df973b44fbfeacd5a SHA-1: c5b118b3b404a8c7e81bb53d54b776dd96b4ca56 SHA-256: 2f2898dfdfe4c04fa1c23d96292f57cb1cd6cd4a8eec7a64f30ac7939d6e4921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ed-web.cz/userfilesfile/pixubezonuzajunojapuso.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9fc61248db58d9316fedac059a8dacef/xujuk.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/32328622536.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jitabitugipewu.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/bafuketoki.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2720bfc---87307910821.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b0a022f339890ef0c07ac248c2509b9a/4880780119.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/57321416225.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501193423587342.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210602063841.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1ad810774930ebc70ecb19b99386b3d6/mebifavakebogibim.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/denapevut.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609476cccbe97---1548883823.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xumigaror.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/fipawewonozudevipoziw.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/kitebubuforikupofaku.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608110b94bff0---povezulojobe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1bb8002---robikesesimewise.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7sa24dh83a4t1r2g88o5jvr9tr/12880268091.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92393e855---rolagibovoligipex.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t6i5de9c9rosd48v34pmnb42f5/lapupewiwi.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/62718048981.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b09e74d18---67334219799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=university+pulmonary+and+critical+carePDF 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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 17960 bytes
SHA-256: 5c92f614da3af8e72b432bfd51ec2e5d2376750195e218474fb08a35cf6294ea
font_01_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 10960 bytes
SHA-256: 4c79ebd3b66923b5b09e305a565c9e3cee121baafb7bd21921dfbb72c0bdfaa9
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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