Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419297544a90c81…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 14:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4b9f0b93ff5e7185541a4fd50c55300 SHA-1: 405bc2fb4c747cb994f48caded573221622266ba SHA-256: 3419297544a90c81b28348b77c123653ee77d92e40ae7931e76fddf510eb4701
132 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically 'Pdf.Phishing.Trojan'. Static analysis reveals embedded JavaScript and a link farm structure pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3985

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.
  • 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
  • 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://sualpturizm.com/userfiles/file/wevul.pdf
    • http://www.nachtruhe.info/up/files/39580464290.pdf
    • https://cheesykeju.com/contents/files/88657807848.pdf
    • http://gold-carsales.com/js/upload/files/14420498034.pdf
    • http://sangsangins.com/upload/upload/file/jeroxowajag.pdf
    • http://elementsgogreen.com/userfiles/file/jugugasoxulujuramiju.pdf
    • https://xn--49st2et51duvk.com/upload/files/mexajaxazuveruxowizodilu.pdf
    • http://laclonghotel.vn/upload/files/9865055991.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pegakebaxaketopagej.pdf
    • http://amongelite.com/ci/userfiles/files/ruforatakovi.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb970b38dc---ligipiforuvisifipet.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/64574824764.pdf
    • http://shahnawazonline.com/uploads/files/jupirodutunaleg.pdf
    • http://instit.ac/ckfinder/userfiles/files/15567260626.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ba38c2f165eb1e1c5134b118ebf72a75/36504234996.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/73505157122.pdf
    • https://refakatci.net/userfiles/file/deramadixabalut.pdf
    • http://crm333.com/documentos/file/62827787608.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ib7fia1h8cjon2g3o1gt3qjppu/fajuzumaguvesare.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/88178431681.pdf
    • http://murasakijr.com/uploads/files/1503340399.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/29288574374.pdf
    • http://studiophotosfashion.it/userfiles/files/26516652109.pdf
    • http://architettoseneca.com/userfiles/files/tazojaro.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612eade82aca3---lesokopifukinonuwo.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/81574873929.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+video+editing+software+for+pc+free+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f438.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 16792 bytes
font_01_sfnt_off00010c4a.bin
5d884a05bde16b0f7e7b00da5edb20fac3b7a81e2a0630ce2e9991639de34136
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 17808 bytes