Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e6a21985f6d4e3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48779d3f07deca35b19ae914cbfa6c09 SHA-1: c305f9a0c4f71ed42c72698b228d623c57b084c5 SHA-256: d0e6a21985f6d4e3034ca0ebc5b309d931639f7feb5d0e4508a91797b057800a
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, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and link farm nature suggest it's designed to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://andana.us/files/files/vumuxugemupekeju.pdf In PDF document text
    • http://it-hair.com/userfiles/zipekobozo.pdfIn PDF document text
    • http://uteambio.com/upload/files/82122759803.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5694b1a0f---20354693924.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lvcrulpsv6v6gvqh22gpi7sps0/famemujureniwageribonita.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/51704406236.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/rexosokabotabew.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jagegifusiruwat.pdfIn PDF document text
    • http://hkwwta.org/userfiles/45709599428.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/23689085080.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/tixor.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/77516907316.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/ruvebagemafep.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/dptoe2dh1nemi1seuv7nbhja50/27323528435.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/misawoxosuxuleveji.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/15470171822.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/mobubasijurax.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/falewipezonobozaguze.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/27968267524.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b59637187---demomuwafuguvozozirojowa.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/mofalosabup.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b72802412---8970824909.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210905150522.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/xesox.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/3282132183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lamb+to+slaughter+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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 17676 bytes
SHA-256: 9a3bd883c6816352f5f23c4616aac639e2366a83d762b077d85ee638b694eed4
font_01_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 10948 bytes
SHA-256: 8ee1b1a0bfcfcafe568119710c306ed269f37ec93a98d44cea7cfc2c125ffce0
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1