Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec232b1f69cdffb…

MALICIOUS

PDF

90.9 KB Created: 2021-09-11 08:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80166019d06d1bad6d0e8542d31b59d7 SHA-1: 2d9ee94da325f152215de99345f2f84169b412d4 SHA-256: 5ec232b1f69cdffb8fd2fe2e9e11335985990e8821ef8dda8a819124b2e5f013
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the use of link farms on disposable hosting and IP addresses to host or redirect to malicious content, likely a phishing lure. The presence of a 'download button' heuristic further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it may contain embedded JavaScript or exploit code to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65501202340.pdf In PDF document text
    • http://opersan.com/file/nabatixozorulodivojute.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/wapomuvesebuputokeravuze.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/maduvenurimunotetegak.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/webopikimi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/45415690187.pdfPDF link annotation
    • http://qdxqw.com/uploadfile/file/dusakulomalununuwekofan.pdfIn PDF document text
    • https://rcot.org/userfiles/file/52892429256.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetozovusoxobofel.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/13373760322.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/34196966389.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e05d26ad64b28475cab6a513568bc5f7/12221229699.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/filejemeri.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/figiv.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/879035f6cc770f28e7043d80e16fd7d4/fitomamutebetajabogodefur.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109110001006111.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/tobobutimajidiwep.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/vesizokoxetufomagojeg.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/28512926501.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/vunelokujovesemober.pdfIn PDF document text
    • http://uteambio.com/upload/files/jogapilodiximijedeviluzi.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/pifuxebipiruvotosarom.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613172e966fc7---kilidapux.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/63890124961.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/45530643837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=art+of+fallout+4+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_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 18648 bytes
SHA-256: 1f65fa5d33295410d29f2455319470bcb1d6b50ddc9467203717dc98776a89ec
font_01_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 10152 bytes
SHA-256: ae8ba48e951d274ddd319ec06989689ce57cdb36a3552c480ad75c67bcbed3a3

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