Malicious PDF — malware analysis report

Static analysis result for SHA-256 918214c288010a15…

MALICIOUS

PDF

74.0 KB Created: 2021-09-27 16:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c7f58732c507cbac4a01b5622f2cbf0 SHA-1: 16d787d7cab791d83fbf08e97cf5b77656b51071 SHA-256: 918214c288010a15b60e979d69d7f803d18f30f378185529bb3544c4b22fcd1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://markyatirim.com/resimler/files/moxivedatuzok.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d95061086---junilat.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/45784782415.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109181802238265.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/mikezunutugafiwixokad.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/xajalivizidobejetel.pdfIn PDF document text
    • http://klhl.com/userfiles/file/22898550922.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/52102666059.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/vujikuvuvapipubarifus.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/5272476525.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/fugikadefu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/pifakegesuruvafurinepelon.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f307656fc0---gikosiwato.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/mofata.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/57465392310.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/notadaxowobozofuketag.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zasowewibevowires.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2b38573d---17916977805.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/lelurexiwuzaveje.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/67359791741.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/numijuvigewaseguzi.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/papolebutuwixoloveme.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/94913944587.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/51089575241.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/37128193625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=essential+grammar+in+use+supplementary+exercises+4th+edition+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_off0000b851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 18164 bytes
SHA-256: 51930860587b34dd7606dadcc061078b56892382c12d82d26abe1afc8dc84126
font_02_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 11444 bytes
SHA-256: d632d8d48c6269b4a58c66f7dedfd24128abe3bdb262954f177ae1cc5f612f12