Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9996a4913865bc…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 22:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66aee2c02d0ca8855dccd09370805db3 SHA-1: 70361ffd21064ca23f1023261ef9bd23e44ba58f SHA-256: 0a9996a4913865bc1cc00ca59ea4c2f2ae1469a006f8f0dfb029e494e596dcbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute a secondary payload. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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 https://mkontakt.com/dat/file/4118991190.pdf In PDF document text
    • http://icbiz.ru/userfiles/file/sireronaniragux.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/mevavoz.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376ecc6e071---demirusa.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/balumitudata.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/80253067763.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/mezivuzobikosupip.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/duvunivekolebusoxezidobud.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081756379895.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/lodugofoxoworanugulud.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/viruwo.pdfIn PDF document text
    • http://korytnica.net/data/files/24463835259.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/moniwatozavivogejigalanev.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/rusilu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/87590316712.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372ec58372f---69969739973.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/lejigek.pdfIn PDF document text
    • http://koala-al.com/d/files/wovavelagenebil.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/lomupovalutusa.pdfIn PDF document text
    • http://terrietanaka.com/library/files/20290567849.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139191b84343---rujudodafuje.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41750275849.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/6185554675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3d+cake+maker+mod+apk+downloadPDF 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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 17780 bytes
SHA-256: a808ae1143894e21ff4ff8efd735297e31032a005a5a7a95fdf3aba862381600
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10568 bytes
SHA-256: bbf5d221040628dbf3463a0862f19a4ba942a57b0db1a23df2b31fe8bbb783b3

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