Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb76350f4e0accca…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 02:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9367b83974c7093ad2e03fee781a764 SHA-1: 71d54fe7a2cf241dfaf31f41b967456d1b11d2b1 SHA-256: bb76350f4e0accca2f5811df2b0d8df44fd7ccd464b877954f95ad929bd41576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=2+person+ladder+deer+stand PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39e5b9ba1d---wodorimoxelisolom.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/gajilewejabukewes.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/70764603666.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nimivujuvaxu.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/75735234686.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2185aa3458cdd350d94eaab6f1d9a31a/78053987464.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kimoguf.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d734f1b71---88502440558.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1f75b7160---pirarizu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6c49cf67ded07996d03155bc08b89109/telovapituzaveza.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841a4f1c0fb---27917260722.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77df90394f---64162034074.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/70055832448.pdfIn PDF document text
    • http://iphysiology.ru/upload/88287379060.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/98850801789.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f9ae217cdb81a39a8936b0f0fe4b7c5f/lunisizufo.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/57846478422.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafepenixefudozezugun.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/29912446373.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/e8b33228n9lvpk1fg53k7c4v02/88957674347.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/82508661611.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c81d0f442---gefikab.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0353357e81---nobozavufadogipafe.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/26808478033.pdfIn PDF document text
    • http://pronobile.de/catalog/file/39301559944.pdfIn PDF document text
    • 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_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17816 bytes
SHA-256: 2b79b1a9fdc87a83e8794db14ca2f364ee86ab92268f3da5ca8e83e32d9fe1b7
font_01_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 10316 bytes
SHA-256: 9b6deb5a5305a6390ef9ff605a546ddcdc76c15e504595c44baab622c979dcac

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