Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e8c4e8ec15d3f5…

MALICIOUS

PDF

131.3 KB Created: 2021-07-03 05:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 42a3fe4d483f668305fb279a2b353b40 SHA-1: fca0dea85e2c6df94e69969d987686d43211e208 SHA-256: 58e8c4e8ec15d3f5af1dc3f62a8efaa967389188b1b404793c686400698e0558
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content or exploit kits. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8847

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.
  • 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://thai-airpark.com/ckfinder/userfiles/files/22924239177.pdf In PDF document text
    • http://talleresjpg.es/img/file/81502798954.pdfIn PDF document text
    • https://5uempat.com/contents//files/fifivitixelewagufapelogo.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/93993631775.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0097a1e2cace62beaa0d7850e5402773/fovezesagag.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/21732967600.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba4ec09cb---5025038935.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5fead4f60bde6b94c57a9c1c14fc4b7/najafikezib.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/cd25c3b9b649e344589f9e129d112bbf/getuvarugizovupajorufi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/wixorowutefi.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7jpdmichfhbngsgnkj7oarbi7g/9602987849.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/97b10be32dd1587b9316a3f2c907b6e6/rejugixawaroxekuvuxi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf604573---37058465266.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5053f24f077488ab26f9fc685726af9b/21837225593.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1medkengkosapoph9dva4r0k2g/sikiwo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/37d5e494409610eb942fec5c334c24a1/vijebofav.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/kiwomadorojowepofidut.pdfIn PDF document text
    • https://edarky.net/data/file/28438493641.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71679554311.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8d9f181e---kutusidanek.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/6279866940.pdfIn PDF document text
    • http://apcmagon.com/userfiles/ranijugigilixijilesi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/46181899377.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ae1effb1b05---35886858029.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qpreetschanr7kdp7eev7ea0pd/wuwolupexejo.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/72870253436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=arabic+picture+dictionary+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c571.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C571 30716 bytes
SHA-256: 4906960f989ce86da2cd116ed4a79711777bcae6ffd28801249c9f45e2d01bc9
font_00_sfnt_off00014bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 10864 bytes
SHA-256: 7b1c851bf7e2b80aba16b4cefaf9b450dec1b700cc3d8676588e00c7edeb06c6
font_01_sfnt_off0001650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650E 3668 bytes
SHA-256: b3ee4d33897ba86b99e9f1c7507c5a119a4c834c9f787fc3f9d282e2c477a2ec
font_02_sfnt_off00017366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17366 22328 bytes
SHA-256: ac689f5d2a7e26cf18d5d464ce6870130617a7f90b08e8b22632b7849430f157
font_03_sfnt_off0001ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1