Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc09fa16494842f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 07:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebba07fa297fdd409da0ec28f13c7765 SHA-1: 78fea116b75b6b6b2f07d35d5604f81f3ca0db90 SHA-256: 3bc09fa16494842f993e6ef32ee8f393f7462af754d5f714d274fcf99ba63251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised websites and disposable hosting, likely to facilitate the download of malware. The presence of external URIs and link farms points towards a phishing or social engineering attack aimed at tricking users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=windows+10+operating+system+free+download+usb+bootable PDF link annotation
    • http://quesnelbusinessnetwork.ca/userfiles/file/josafatovelitakexewepeji.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/49032830774.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/51831851385.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916033410851075.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/97bca22500dae8150c6fa2a99faa0eb0/gosibeturije.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/gebetijopuxepuzufupa.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/64642007454.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56857881708.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/pujejunepexalopoxulej.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/94768192362.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/lowejobosujuruzipe.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/dadezevetedepilutunaxan.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/lijuvik.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fcf6c824---vabozikew.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/dibodoris.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/sidewufazowekukesurabo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd58c66f4---55566906682.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/varusojowolukapuguvi.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/nefojetujoxokepupuvobo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/937208310613deca023da8.pdfIn PDF document text
    • https://filetorme.com/upload/files/94504652385.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/49307773681.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/29320966263.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/vedamogejiwefogoregolo.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/bepubumowutikotiwiru.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 11448 bytes
SHA-256: 23ae3026c44a93c2836509d61a9640b8280e92f8c48c497dc67aee89c91d17c5
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 17440 bytes
SHA-256: 1029ce6c3176b7f6e61f28b5069a157df5ad31b2f21b07dc094856d4047f75a4

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