Malicious PDF — malware analysis report

Static analysis result for SHA-256 395273a3d2d67e9c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 06:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc5146a8317de7d13be1bc52dc130241 SHA-1: d1ce6f13aa3db801989514ff329639d44aebe38e SHA-256: 395273a3d2d67e9cc91bfd0a53cae82aab6e390d9459c40fbb9f705983d7ab80
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dabaa9ee---sozodiz.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160795d308ea01---14342426125.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/5765912778.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/93810870982.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c160a17da45---lonedisirexowo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/siluxoxobi.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/minexe.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/67610908084.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nipeluxukubutefubokaneba.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa1cfa9f---pifujujad.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210620132340.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/22564127154.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/79544137656.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/39158132505.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c3d8c00cf14c408e19b54f4abd11781e/93810827595.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5d228c8c0---78976180282.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/38101999986.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8d36f882---litolugigafunezusa.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/41087121519.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/48387a970ba42c3833e54194fef36ece/zoradevuwadekozigal.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/de580ae5601d09f7710f081c926f6621/kotixagugezetonafoviluwem.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/25e32bacc278b15d1f3cfd60908f7ebf/bajakupijamegigukezad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=definicion+de+estiramiento+muscular+pdfPDF 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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10884 bytes
SHA-256: 9d61ba45ed41988fa2595ef1cb6cfee7813f4bfc295c1b3367677d5288a35535
font_01_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 21712 bytes
SHA-256: fa4918ae434c977e4c47b4e4e05f30b794c1f33f86cb98eda03e64eda045741f
font_02_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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