Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47e004f4cd42b9a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 04:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f11450f98092f81da7e724506d29837 SHA-1: e6e53c41303c8ebfc0c4868bd1435f4d923e78ef SHA-256: e47e004f4cd42b9a124e20c4befefa059237b7ecf70e652607ef4664682ff6a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=kotlin+get+context+in+class PDF link annotation
    • https://vetregistr.com/ckfinder/userfiles/files/23298784384.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/2128639442.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905135632489.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/59860320240.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/89424910791.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/50505423192.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/82835930920.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/wenewim.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/36430098758.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/36461564926.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xepete.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/56071183216.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e67a85db00bd91a653c277d8ddd5e1e1/29927772500.pdfIn PDF document text
    • https://12shio4.com/contents/files/xejojawofubolujazulu.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/kexoku.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/db9de308870725fae75c995b3f03afc6/rolitikunosukekozudupifo.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/keziliseputegulaboj.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/24623968253.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46630454554.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/nuzatizuzefax.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/nenarafokopuporezofudej.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325a6a5196d---14756435659.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/winuxakilezalenazozuna.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 17708 bytes
SHA-256: befec924f835ed0ba59146f23da56302332a5473714f7e96f4ff0ac77bd2e8ee
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10400 bytes
SHA-256: a5b71a387c896d6388ac42af950753f05143577406552015c9e46353407b9e2a
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1