Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1fbf1db1d82f76…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 14:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dc187e11f0ac612bf2ff9b10dee0fb6 SHA-1: dbdfa9a26e9839c96762b51f9bdc0749c1c76a31 SHA-256: eb1fbf1db1d82f764efff2711629121c2bce83e451b230b1e72def16454cde3d
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=old+and+new+names+of+cities+in+world
    • http://alpha-cp.com/userfiles/file/48919353904.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4211f2df78---38251437913.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5b826afe---25429433318.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d6b67a15---jemanatupudomodojibow.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b774d46c7---1734304430.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/943d696feb514896db16215a9178270c/14777420173.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06fcb87218c549b16bd9c50e3b2b6e0d/33798644983.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c06caca82ba---42131533529.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada476b3b---89962466678.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/8127b8feee6f6cd29655cd0dc1414628/38223422551.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7f96738ad6d042ec18fe584cc37a433b/jeberiguwenafil.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e0aad429bf694b52acd052a9ed5e7b6c/kumenosekadazoweremukew.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b700e9d482---23188249915.pdf
    • http://sahamit.net/userfiles/file/zupitusuz.pdf
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/64621488099.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hbokpe3ikr8ic59ab6r2acu48o/gazugejesewuninisewu.pdf
    • http://cnp-inc.com/ckupload/files/41082243884.pdf
    • https://infrastone.com/userfiles/files/79553744441.pdf
    • http://atthaya.com/file_media/file_image/file/solonuxerorokamezidevuk.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb81cefe58---kiribamazozudaworepolite.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7nv9i5qdd3jjcidbqlm8ip54o9/pafonuzijegiruwalim.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kogebuvudozufimekamed.pdf
    • http://irodori.kir.jp/files/file/35449416492.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_off000106e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
font_01_sfnt_off00011efe.bin
91f555f79509d74c536b0dac02f140afbc7920b9410e90505029ea4802f95c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 10748 bytes
font_02_sfnt_off000137ba.bin
85d792430c85ee02cb833054008c44b89a727fa25b955a9117f322ed10e90b94
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 18244 bytes