Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026936d0eb3f675…

MALICIOUS

PDF

72.4 KB Created: 2021-07-18 00:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65593f1f0a1db01866c97eda326ebb51 SHA-1: b0d8050cb125bcb294215c4b423d67c081d13feb SHA-256: 4026936d0eb3f67599790317ff7fc03e41bbf4e37ac7391c17b97079a77f8e4a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984475394ba---kamiwisebafevunibo.pdf
    • https://palcev.ru/userfiles/file/pavukebugelufe.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ev4bm7ler09k0hd98rebigqb9f/xigiwutebogijarunudonepi.pdf
    • https://walkandsmile.com/userfiles/file/fugugenekorusit.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4de401fad---67894891785.pdf
    • https://baobihungphu.com/media/ftp/file/36540513095.pdf
    • http://infinivideo.hu/sites/infinivideo/files/94167110555.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f25b9eb06---39975438191.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/22995428193.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f576e7b3---belevafakimubosakokogab.pdf
    • http://xn--e42bt3l.net/upfile/files/3086729573.pdf
    • https://amd-export.com/site/upload/file/58361900249.pdf
    • https://bahceneryaman.net/public/content-images/files/jibawamiketavuxis.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6d3a9045---xaboluvebusigasubamos.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946d2ab05f---rusekivekex.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u68nrq6k3jlveoui412498cnuq/nuraraserarotuxo.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/tolinofemaxavo.pdf
    • http://phdpecs.hu/userfiles/files/45529518945.pdf
    • http://c-amc.com/upload/files/pikag.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/20315974942.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ttlm1g9d00nvrb8frq6osa89va/43980740907.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607294162c32f---misuvi.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9773141ce8a620ced9538291df9300f2/34072541098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reported+speech+introductory+verbs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb45.bin
44c06b05ed78b38a75e3d3a2616fd01ac45924c39dba7023243afc9376e05a63
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 15748 bytes
font_01_sfnt_off0000e390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 16792 bytes
font_02_sfnt_off0000fba7.bin
d960cdf028feefa2e1b6dfbee513dad8b6e82631706bf1561a39f1c61fae7384
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10868 bytes