Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daa2a3194ecfd26…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 00:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87a79b102d0798f529239d85f7354b1a SHA-1: 8d420e9b8d8d745e3f86e4f84cb311a2ca88c9ee SHA-256: 1daa2a3194ecfd266cca2262e4cc19a4f1ac30d7c952d2f9fd22dd9c68d3848a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beldapromosyon.com/calisma2/files/uploads/kuniliposolonibaxojujo.pdf In PDF document text
    • http://abwingssuffolk1.com/uploads/files/jenimi.pdfIn PDF document text
    • http://hotstamping.pl/files/file/31906039238.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/up0cbltmd73cdajdjljka17b5q/rurufulivatulupezagopo.pdfIn PDF document text
    • http://topas.lt/userfiles/file/12631428541.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/59284961371.pdfIn PDF document text
    • https://jensbrode.de/files/file/zopadukarowa.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233dc7917c6---61974604867.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2bb35a16---dubadorexopuvamumegis.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/89696985961.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/vafewofomodebugogug.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/59374706436.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/53852286845.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/jebok.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5153c817---penagajabaxomelanadog.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/4pcr4mkqfhaq81kpf7j5ss3aa2/fonuzefuf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/465cba86de69f53c4ce6ad38ddefb955/vevorowowuwelafe.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/sopajuvinetile.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/76796211633.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/zefevekuf.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/79750864796.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb83261a8c6---gifakujekemobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kalnirnay+calendar+2019+marathi+pdf+aprilPDF 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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 19944 bytes
SHA-256: bb8f12f400d84705262d05074cc05544c8742d8c7acc8a41b88a0c48c2616ed2
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 11164 bytes
SHA-256: edf47dc1558383cfb258e8017ee1973e6ded75c69abe62b84ed9e97525d109f8

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