Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ac051b82b16ab1…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04d34f506e102d93b78bde55427f8303 SHA-1: 613127e8c1b617081467389b3e6e28ef23e323db SHA-256: 46ac051b82b16ab157c004f206261ed5ebbd8fe13a7869c05809929a707ff47d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ferropula.hr/files/60378016248.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079042fe7ea0---nuvajeditasazevuwumamed.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/39321298670.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ltktl539ba6b2huhup3chllv65/87251130806.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1b64f1f5---mobezasuxix.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/jozamefosupajomibezevexit.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/92282032318.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/971npro2ronkpsdj86canmg6m7/fokaxo.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/37382712895.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/gunuvotapidunimuzaxesilos.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce236d207697bf32bcf1c1144012a0da/jipegojitaga.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/75125316679.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/dp2h5fmnrcsvl9v1imnq2aq574/jekewolojunovivapuburulo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/dagizoke.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210613074959.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/hs6n1k1mh6sa41elsj7bfkur6d/89571375778.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wijuwuvepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b7190055---61528121676.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/29569547332.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/44117827116.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bower.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/57664735807.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/4891913936.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/80926952717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+draw+iron+man+handPDF 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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 16716 bytes
SHA-256: ce5a294a705c8bf87e152db973dee8ba116d8e131fb59cd1783a52e47a1066c4
font_01_sfnt_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10244 bytes
SHA-256: 92c7882d2119d5400dbd18c773c4376b9339d97e9cf9647a3171c471b6b8ba19