Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e904fd7e7f21a…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 23:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53f04c0c28049801b7177fd647d8a05e SHA-1: 471de98b8e9927b72b22c1ea34301fe071bedc19 SHA-256: 4e9e904fd7e7f21a01de251cb6004b15933e3e6c15809c254756ef1f42dbd747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d44ac18ba08988ed33bf37a14a92bf21/63248490737.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a9d12d77---30796441314.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070710643b51---ladisinufusuro.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878bec1a59---11165160700.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075784061e85---64513941836.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f67999229---lizibojokofenobotig.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ef21dada0cc2b35d4f757cda3f0ddea3/guwabajowefogewekaj.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087894f6b6b4---6152139714.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94fcf5dd7a---7868528537.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/51503af03935366d032c02c04928086c/21389326359.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/22f71e9f31bba2c8840426e4f1fc3f6c/16788070814.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f0c92e83---novufogot.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/geferepaki.pdf
    • http://honda-vo.com/upload/file/jabipufekofanixolum.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/94m2b9uide33uim95h4lvv7smg/mijeximosamedubipov.pdf
    • http://garderoba.sk/images/_file/85877490617.pdf
    • http://engroupe.ca/aym_image/files/12051518869.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b551eecb63f3803655d664ec1d77af16/51624483427.pdf
    • http://jjmcp.jp/userfiles/Image/file/68882988536.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea8f2fc67---37657503932.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3638b2d5ce---labotewa.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/61528cf67b836fac469da6f94df0a7d2/19420726672.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=case+study+in+education+pdf
    • 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_off0000f44c.bin
3f69cf4e86e5592f1b107f17033baa279ff0b24286a7d61452654ea3228eabf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10712 bytes
font_01_sfnt_off00010d17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 16792 bytes
font_02_sfnt_off00012529.bin
31b02098d3b2b2c0eb410028c5547f03371f7acd84043a497690c798d5594f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16964 bytes