Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba5accfe24b7fac…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 22:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03862fb267b6d7269558ff3d5d80d050 SHA-1: 8071bfb6d513f2837de387034527ad2b3a3b1852 SHA-256: bba5accfe24b7facd17917eaa0aa88deb9dc1afacd1566eb1eba352fa7cbe0ea
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with high-severity heuristics indicating it's a link farm and a remote support tool lure. The embedded URLs, while some are marked benign, point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a remote support tool lure is a critical indicator of potential unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://files.ibiza-ferien.de/file/85247291039.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0f1bfad3---gipumoxatatuto.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d364330134---40394191881.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/kevobuxawojizimav.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wanalawiwuwogabizafoxow.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pubibutopufiko.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/12642216457.pdfIn PDF document text
    • http://prestopc.it/upload/file/30681191790.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/zurugubi.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/xubavog.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/17560424262.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901014537.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/13018716611.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/27198500519.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/gawukuwoxumo.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xesatojiparerepuvid.pdfIn PDF document text
    • https://membermimpi.com/contents/files/xenipupopi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/78273033691.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/palulujupojamani.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/19735771082.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161381b7582c04---puzutedorotamuzogegizizi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78805171811.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/18963302938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+there+an+app+that+can+control+another+phonePDF 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_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 17656 bytes
SHA-256: 399167f18ba49c15e8b5576eedca01201027d52b578fe38cd72ba5eedb5c9645
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 10332 bytes
SHA-256: 70ad2a77c067aac284d07b98e6e545ccb0f948a3b54c3e25a3ecf6fd9c40301f
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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