Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a47f1e7b97ec8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 15:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b9c743e85cadb100a162bec99d0bb7a SHA-1: 2900d478ed0f75f3ef05b8e78464a37c5d764e2a SHA-256: e84a47f1e7b97ec8de0aab8632c07382ee868319e9e58a4863958d66e19d781c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=airline+fleet+management+pdf PDF link annotation
    • http://haenuri.net/ckupload/files/silopuluw.pdfIn PDF document text
    • http://chapelguild.com/images/usr/24652367207.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/28156393064.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfe1162725---91299735439.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jogubozemigibumiwijogit.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/71843723552.pdfIn PDF document text
    • http://short-story.ru/upload/file/jemosipekazumenot.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mekesisumugexadijubiwusov.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/26099655048.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bb345ea567671df95873095e29b1dfc6/tinajerasunidur.pdfIn PDF document text
    • http://home-plast.ru/foto/files/6234494248.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a052e12c7c---jisum.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/tipul.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/12608799748.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/betupolewu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gaxuxuge.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/31724741663.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844457495ca---nezugogu.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e89e707e29---50925027112.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16940 bytes
SHA-256: 7784248281d13ab44d1d7b441c992f65e15ea36cf8f8c83bdc5800d5e3c36bc8
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10532 bytes
SHA-256: 5ee6ea174001f2973562f570ae9e67a985383901b3060414d6036f7fb8c0c902

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