Malicious PDF — malware analysis report

Static analysis result for SHA-256 e475a4b202d0238b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 12:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63ba4cfb6235b9b90a3d28c4572db4e1 SHA-1: c46cbf03a534481b492d213308a2234ee79c0f97 SHA-256: e475a4b202d0238bd8486df7dcfd226ae45c02c424f8e4d1a437869f431d1b03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://vln.nl/files/file/51021742473.pdf In PDF document text
    • http://0048.pl/48files/file/meliju.pdfIn PDF document text
    • https://projetovm.com/uploads/files/40017503954.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vuruzamivi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75371612728.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/xibasemamufedomu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xubaza.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/44262341155.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/46700963505.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/kekudijulilujipupi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fded542b6d---kisiloxuzela.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mizutibe.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wunotej.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d141a8e8---63408287204.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/57840772938.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kevelatebowegisixutul.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/fumuverudalavobixiro.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbf61afeae---66471814211.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/womuwosikijokirelidi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210912_123806.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141c648257fb---90787156586.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/duwutuna.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/47380097520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+live+tv+apk+for+androidPDF 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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 10700 bytes
SHA-256: f0ae41d73fae079a479b67b4baddf9fe0947229300928e71e25cf84de34e6bed
font_02_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 17676 bytes
SHA-256: ae61430fb10a5438bb6859d56557da90dc5be6af15fb06988714e8e99790bd78

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