Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04e23d59a75cab5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17dd03f68470f1b5f3be80aa803a0878 SHA-1: ffddbafa601a12609a08e2133cf8d9e80a4440a4 SHA-256: d04e23d59a75cab5724969b4e15fa839e0521eab226d9ef724cdc08dd5699666
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. Heuristics indicate these links are likely used to redirect users to malicious content, as suggested by the ClamAV detection and ML classifier flagging it as a phishing trojan. The presence of multiple external URIs and link farms strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3a403e6b---fudaweke.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/waginuk.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109250919431507.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/batidavunakasose.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5079330---24404801888.pdfIn PDF document text
    • http://lscapital.it/images/file/50405526904.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ba458c889---67415125260.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/47698908158.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nepevumo.pdfIn PDF document text
    • https://kultmotor.virtualbodybuilding.hu/images/files/66752008310.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/78559567046.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/bijezupibijipukogodokama.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xafifotuzavog.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144febc3e5b7---vobowowaxuziwivexarixa.pdfIn PDF document text
    • http://japhina.com/upload/file/47444784753.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/senip.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2a31f32644fda5b4a2f62048ac716083/39536352718.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/wetataxewaledilabafowex.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/numefoniwovixupalinexaga.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/wudajidozume.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/78931022202.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/69258923787.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/dubawawuzogev.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144d536be18d---18530760256.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/77508991395.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51619977755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+online+movie+apps+for+androidPDF 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_off0000b210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 10604 bytes
SHA-256: 0c71ec7de7bddbbc890345e4b380c60db87f1ac028c38c0dbdc7c11e840552d8
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 15120 bytes
SHA-256: 8e76b3a7d81039defc811f47571ed23fd4f1cfa079b40ed7bb49bdcf7b167308

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