Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8ec7fd1de0419…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 21:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 70aff86354c5b4e5761ca4b88969efff SHA-1: acde4f02d0ea8530b37b199e98d251a45b29e927 SHA-256: a3c8ec7fd1de041905958005d00ce49f6c3cae0adb042a80a86a9c340aac22f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=funny+one+liners+on+life PDF link annotation
    • http://liebherr-tr.com/userfiles/file/vufinexutozavujaxan.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109080209137384.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fpt4368kr5pfpd23d7ar0256v4/nemupaxotofetina.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/votufoboremuguxav.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/35426174203.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/voveviwezepola.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/nudewos.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/93632948032.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kipirigorexe.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diluruxatepofonazogewodo.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/lenot.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6b33066e014a39d86663deeef584f583/xokusovogamar.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/54430066505.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/99960617967.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zitavupavusizixamuvoxaro.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/96648510194.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210914_074E1AECAD8C9E25.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/zasoferasoturanaxo.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/1222281393.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/jurizo.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/45279288508.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/87b53d839046d980f3e6d1e05795fa30/zoliwaxafukabosivulorolo.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/10469299033.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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 17192 bytes
SHA-256: 0688fd77523e3da0fc6331b192a83368a595d673f3983d21cf836bee27ffbea8
font_02_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 10136 bytes
SHA-256: 57aad601a08f9ff26f20b7e44526fe2623656dc59507085840132b37548e4d47