Malicious PDF — malware analysis report

Static analysis result for SHA-256 531e7538cba5a527…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 17:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8964fd84b834291649d000f9210b6c6 SHA-1: 914356ef97164730796c27417397b53097e6f534 SHA-256: 531e7538cba5a52727a2c9145c3ad58f1f357d1f32133e307ed76f18fe3447de
164 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, detecting it as Pdf.Phishing.Trojan. Numerous heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage and other disposable hosting sites. The presence of a 'download button' lure suggests an attempt to trick the user into initiating a malicious download, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=detail+magazine+pdf+free PDF link annotation
    • http://vitalenzyme.com/uploads/fckupload/file/bovugigofizu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/ruzafepok.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/19750566628.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/jipuriwalaverazosa.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/29827651721.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/97428873606.pdfIn PDF document text
    • http://c-amc.com/upload/files/70192437593.pdfIn PDF document text
    • http://jaatkinson.com/userimages/56563990766.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/89047738665.pdfIn PDF document text
    • https://bauarch.bg/files/povef.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/20fd8d0ff7d3768f1382dd22f7a2f2e9/97687767091.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/lodudugi.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/lanivet.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/18141608283.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6b885701---75436065242.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/78878072376.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/jebebomiwuv.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/38371361927.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e120b70dce3aaa8690b3eded62c5e7f6/58450185684.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b8e9fb446039f4fe9161d6a915e7c371/zilimamifiv.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/68409399154.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/vudodukefemogitizusowix.pdfIn PDF document text
    • https://arendic.cl/files/noviwi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a38ddba57f---35644513415.pdfIn PDF document text
    • 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_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16560 bytes
SHA-256: c6a58e6dcb6be765fdae24a991617e08a877ea7e801c2179bc2bf20e832aa7d9
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 10616 bytes
SHA-256: d528e3cc8f99f0078b8831942c0cbccfc1e8c16b96c82498832cd8d9457b669d

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