Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d8c5673050ecf3…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 14:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09b30d0a3bc7e668e5f0ce8b7dcc6bed SHA-1: 8c4b7f09d9e9d3d08175e3ec3c42623ba69860a2 SHA-256: 37d8c5673050ecf32292bdc1bd6db1e2b5c9e23e3966bafc21e5189d23b9c25c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to various domains, some of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=ugly+love+pdf+free PDF link annotation
    • http://healingtown.org/userData/board/file/sagijimubefuj.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gexigotekejamosu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/87832821557.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613939e71dc46---pefazuxeturoxigugosotadu.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/67470404025.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/11287160574.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/tekedubogewifopelopidu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/11926398209.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/sedafegasenejolujokiv.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pifexesodabisesakus.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xivawuxopinujepizujexikuv.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/vuzinolawoluzuwawuzoxoroz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138940343d17---8956944177.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6e527c8464589838f8b56aec2442cda/mojotunatuzawolezemarapo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/zevopusi.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/67727395968.pdfIn PDF document text
    • http://huefpdf.org/upload/file/16313961267.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/baccd263fc90b7dd1fa987a987f21ca4/85379536620.pdfIn PDF document text
    • http://scsychem.com/upload/files/tajakezilizot.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/11170974090.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/vosopujejibuzosufena.pdfIn PDF document text
    • http://mayjack.com/upload/files/72540660785.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130023118b37---xagefutuzoxavesopemom.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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 10236 bytes
SHA-256: c0e9a8d99187a316460c6739d178950f527015eb7f6f41db07ca9bd3a4b0de45
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17448 bytes
SHA-256: fd9331720134148692f7844842ccae64137fff52dfb8c8a1d951b983290cfc05
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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