Malicious PDF — malware analysis report

Static analysis result for SHA-256 e656db5431882dbc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 01:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf44ae482f12b13ec945d8e3694ed9da SHA-1: cd7a19683384ed0f15c8dab9ae6c49b7d717195b SHA-256: e656db5431882dbc1ef7a7b0ccc8c0e6fee96c6a1440dac2de8a9341cabd854a
196 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 contains numerous links to external websites, many of which are hosted on compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the file's role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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://oniceh.ru/uplcv?utm_term=math+is+fun+tanks PDF link annotation
    • https://ispartaorganizasyon.com/ckfinder/upload/files/2725734493.pdfIn PDF document text
    • http://zl369.net/userfiles/file/56092405719.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mudogejabasadar.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c993a4c0f---pujojude.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/xelodalimejewel.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/vusopovabunirumokanowo.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/30379805311.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/84295248728.pdfIn PDF document text
    • http://imbirimbir.ru/files/lasif.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd576506b6---57912212788.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///zufofar.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ecf2068c---rerenamasomigaparu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414fde59220---vudoputusavowudeguwag.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/11083479507.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/14416415789.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/81063267343.pdfIn PDF document text
    • http://gdgom.com/upload/file/210912200024333370ztdvfdnttenn.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/witunirom.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mopiwejifenevire.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nifalitedeboraxajisoti.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/zuzajezupipudaniko.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fidarusawudesobutaxe.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/46583990931.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/vipogubadakedi.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 17584 bytes
SHA-256: 354052ea44821b1157c52a75e82dc1fbe45cdd0b6a1682217e29b6c8f325d356
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 10100 bytes
SHA-256: 932d57f3075c8132b124fc96549a795fd634c36d3f1050558eebc8483dd3dcea

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