Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f63204781e8279…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 12:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74480d2b4d09b42acb559ca2eb0d6e60 SHA-1: e7c5f947380e3c296be110933595bff448c8d215 SHA-256: 37f63204781e8279fbf4385f28f929994ceb3417991bceebd3bd86519bc88367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=corporate+tax+planning+and+management+pdf PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813b3c3bfb---36971114943.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/nazurironukisaki.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/85896596403.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/odh7iqf20h5vo81m65h64ljdq0/43154233224.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zawosibuwesalipoxo.pdfIn PDF document text
    • http://greenglobepms.com/uploads/42399862496.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/24736794531.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/21293771587.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb9f32b7c---wevojivo.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/geramexuwalararimazibi.pdfIn PDF document text
    • https://onecre.com/images/content/files/fojileguweduxitos.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zivapelazajidiki.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fab547a644---90984245073.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/92579176036.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/gijobelitajugebisawete.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/11170201815.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nobema.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/nerumoze.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/87288118770.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/sovedelaza.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/44949991245.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fexin.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd846ad02f---tilebogabewom.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/42875326833.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_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 14664 bytes
SHA-256: 1484bbdcb5b00c6e59725a6aa378d94c196825219f452c536f63330a2fa4a30a
font_02_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10804 bytes
SHA-256: 2164622448cdacbd8b0b8f8822109a48e99f7677d79ac62771003b4a522862f6