Malicious PDF — malware analysis report

Static analysis result for SHA-256 351e5ffbbd11991d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-14 00:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2186125facedf795a1be2ba443e9c566 SHA-1: 9fbbcefc5f66515af6529f3629503af35b8f7a6f SHA-256: 351e5ffbbd11991d810ae6cfbc25073e2c1ad7f9332dc123045c5c451d1870fc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a broad phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff67182c23---40414226585.pdf In PDF document text
    • https://tamphuctriland.vn/upload/files/boban.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/35548038148.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f508b70944f---45586625416.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/36808495136.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/dedupinaxigipuponekun.pdfIn PDF document text
    • http://abnicum.ru/files/file/gewefolutagolego.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xinofuge.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc23b4bbc---11395453334.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/wolowupibabaxiguvi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/1203754546.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6eg2ib0fdqqkn461drfulrv275/30476377426.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/79949009687.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/43978352639.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/nusodotesada.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/51012922000.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/2370762540.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/68693403766.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd0c703be---46809870530.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/sunol.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/85605449622.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/72723921786.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/zadixovop.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63cba22fd---lurazelibiwuvob.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/2319821381.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ai62u5vq5qii13qsl8u751a4r4/jiketosesufoxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+employment+verification+letter+h1bPDF 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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11108 bytes
SHA-256: c322067987f1333e4e1a259e9e04c8c07d1041fb66441d3dfdced47c3d133300
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 16196 bytes
SHA-256: b4f820e8e430c13bafa427ab9dd2728e88539b5582069a38e29352df7af15934
font_02_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1