Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe7e5b4863a3d90…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 00:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56d718c374f84efe90c069eec0f44dea SHA-1: 704092bdfc8637969ee6bb175f7459cb32464c82 SHA-256: 0fe7e5b4863a3d90c7009db7cf659c393bf1e8960b40d8149739b4e500f1df55
196 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_RANDOM_URL_LINK heuristic points to a specific malicious PDF hosted at http://studiomedicoveterinariobellucci.eu/userfiles/files/sumepibedemilikowo.pdf, which is a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aea9681f8---22688282268.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c1q7a1ngvldo53sicbh8os3dg7/pimonekuvunojeburezezo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68dcb5a00---25562671596.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/9028369738.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/85329068017.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/deretekozokomexosa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de1a15c32f---zobutogolufatuj.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/rudomasem.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2ca79c4f2cd3d27afa6d902bf6050f0f/87714944787.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bt42mq6khhk4fgudtsb3fjd7r2/48599058927.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/92a5113c215a29ee75bb3031c5e98913/32674420762.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/acda8f769b7d3d927e2d9074a8d800e3/doloruvodexibiw.pdfIn PDF document text
    • https://777mto.info/contents//files/8369902785.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab773451d---tujuvewajodekepi.pdfIn PDF document text
    • https://songhongresort.com/img/files/97233100349.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kau3c1bhr39irg0vejtjofclo5/worulexexas.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/22548943719.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/60819467643.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/peritowiximakaxif.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8br1uacp7fj99acb1j72goaef7/24539526423.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sumepibedemilikowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=train+ticket+cancellation+charges+2019+pdfPDF 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 11416 bytes
SHA-256: 0513e6e25bab748377525ad8bef51f9f0c4c46b33bfa57f89fadb32ae2ad259b
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 17648 bytes
SHA-256: ebeed52997b47876544c02d4980c970bd8b121686b9bbc0863c18ef271536140
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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