Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7c7f3c56701e45…

MALICIOUS

PDF

74.6 KB Created: 2021-09-11 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25af2590dc5fbb7fc8a8bcd5b03edb14 SHA-1: 08750ad11e7fb2e6eba2d1287da2a3c991b70168 SHA-256: 2c7c7f3c56701e45141a9416330fd529bf37820e9881b61dfcd55f5b12ebb0c1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613863b1bcbb7---7868813299.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4d67ee15---gomepamaxivinudumolabezoz.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/xogokeridaxatunajon.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/nopotofomojen.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n3n14jm1cttmo1e5v005sft576/rakuralusepojana.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130609e185a6---3802400179.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/59818842054.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/zelifazuwululunepoxo.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zavaluraxorumavevomo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6290024765.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/38547597124.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/78752150056.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/2245294945.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98163803175.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/biwemuxu.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/nifulutunarajatepenafeza.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/13635298277.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/retasadebinigezinovozi.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wubixewisiwibupozodizajaw.pdfIn PDF document text
    • https://betsin.org/userfiles/files/17704117658.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/7935169108.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bdb23b79---fovofevofebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lightroom+cc+premium+apk+3.4+free+download+for+pcPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 15440 bytes
SHA-256: a26c9efa60a281b8552002db991010ed6fd0fbddb09d552d8165562d6d74270a
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 11452 bytes
SHA-256: a4fdce1e5619d046d69cdd575c20b3e8f5d53e950badf2e572074186df4e62b4
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1