Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4daf69b963e3e39…

MALICIOUS

PDF

103.2 KB Created: 2021-08-23 15:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c5cdbf7ef59d3d0a0565d831a92a9f2 SHA-1: 8ec60ab197e3f47b2ff1e8bd94f3778d3e1db9b3 SHA-256: d4daf69b963e3e3952c51da1620eb5b9ba70d55dbc1fecf78c19efd89e42c95f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://yellowmangocafe.com/userfiles/file/lugijapozofulivife.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/36089782557.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hc66qquje6etighbflhac1rmv1/79353532249.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/811494fc9ac5b9cbae7edd61b9c23a3a/bokizokiziveporuvumomi.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/81823655301.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/gofaloxerizatudovom.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f68727ebc---jufuzifexexefaz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c163135a919---33010129685.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/jufakekefosigezer.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2735c2673---42658277737.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503025708215.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/54699817345.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zewinodotax.pdfIn PDF document text
    • http://grotech.in/userfiles/file/20003881791.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/60522277592.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f91217848a90535b8b48abe8c72deb28/fuxipodap.pdfIn PDF document text
    • http://irollee.com/userfiles/file/jitufal.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/58076871979.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tujububabexavuju.pdfIn PDF document text
    • http://jaatkinson.com/userimages/64488107399.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/91200246146.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/43816572799.pdfIn PDF document text
    • http://sireny.net/share/files/dizamesabatuxafulu.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/gofosiluxalumujabegafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=false+pride+meaningPDF 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_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 10496 bytes
SHA-256: d52afa65267778bcfe7da92bc93a864988f4959502c2050ed8057176d18a53a2
font_01_sfnt_off000146f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F8 17988 bytes
SHA-256: 0746309375135cb73d50f678e081e9ed2f7ab139dab3b30bfb6d9b8e6c1d3616
font_02_sfnt_off0001760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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