Malicious PDF — malware analysis report

Static analysis result for SHA-256 8944c385cccd8965…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 10:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1ebbae2b6518e1cc2c830768dc0d4d2 SHA-1: f027cfabe0b9bcf07a3042a939f8b4f82b8a587c SHA-256: 8944c385cccd89654cf76cdf1084fb9ee956c8544677c56df7481d54310bc485
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads. The embedded JavaScript likely facilitates the redirection or execution of a secondary payload, while the link farm attempts to obscure the final destination. The presence of these elements suggests an attempt to lure the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://pratiklinik.com/img/userfiles/files/lilemusenajimimasugosiv.pdf In PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gapufizususifoxu.pdfIn PDF document text
    • https://alutat.com/data/file/kulovibekogo.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fexokozijulavese.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/35891244680.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adca2c275---menatanewaxivilasoxagis.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/duzolime.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/18078033045.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210714111748231503.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71959916d29805aba59ea2f66b3ad139/70115755851.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/lufofimebixulaju.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3c4166d260ef334b994c1c44ecfbc87a/3555203858.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/16591288844.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/65554621169.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757bab9ae47---10922134013.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6bba052af9fd80c696ca31b912a50304/78929319345.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/22464465516.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/rerijiruluwimirilasod.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160731b0bc186e---nopaz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/4616388233.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/af6e2bdd26c4ab5aa03bc30941044b6d/82199362257.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kozokixolilo.pdfIn PDF document text
    • http://mlead.net/images/e/file/29796357245.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nedejafopulupidevilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=delete+pdf+pages+iphone+appPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 10680 bytes
SHA-256: dc682814d70dff04bd750f6c4252b55f3bce79da7b4aefece73d24d663c9a6b2
font_02_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 17064 bytes
SHA-256: 88334b2c960d025218e1085e668b1f03faf474c8738239267fb656b9c0cd69d4

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