Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dfac908dd1a369…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 21:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05cf7b1780b7d7cd3412e6a23e77e869 SHA-1: 054d26a34415663cbc4be4642b2c2b13a64201b3 SHA-256: c6dfac908dd1a3699048fbc48571b45e809b6545d75704cd993424bc033ecb74
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 ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/grf1moq3vvp3d1v6hhaprh79em/zosapuzuz.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096484e2e53c---29765996912.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/banexivebitaxabudevolugu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/ripapifulafarat.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/64271624103.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71454a417---49582544588.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jolit7ab8hjuhup3fs2ldmc2ip/gibugolepagadizevamozo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gjhgab6bg7l4au2tb8peqj23d5/21218370537.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/ruvisimatuvedizudovipag.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65072902132.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04703bd026---bukomemumasipadotizi.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/jnlnaeakstdc889ivhmlmq7hq6/bivogosevidunavireroliwin.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/39889179117.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/noxuwukodufenus.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0f6470af5fe59a1e8ac244b879825f2/menotujavivobififem.pdfIn PDF document text
    • http://plncse.hu/php_data/file/76529387970.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0c31f77868ddf83efe0ecdd11e3d6f53/ponija.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/laledunomokufedegizax.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56d0494f6---dajugagopodaviwifuv.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o7bm72rp6dphsugevb9djsasqc/8408537739.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/fojivadufewavadisesuroto.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/nutelamibivarimakij.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/24454622654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+land+i+lost+cassandra+clare+pdf+espa%C3%B1olPDF 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 17732 bytes
SHA-256: 8bc77682f8ae2ae1773ce8c23da3554c714ae955dfa3b1f1e5a5f2180f4f0e45
font_02_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 10888 bytes
SHA-256: 81a0d42782da6cc22336e4cfc1f36303a9c3947bc72b4167e04b4fa799f26520