Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbd68d52e8914bf…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 05:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6ab4866a60d8da707bae1c4f805f9ca SHA-1: 3afc37bbb2095ac5ee9c69a3baa1a6973cc617da SHA-256: ffbd68d52e8914bf21be3cdb3375fd633230c499d6f125fec3a1159fd51a371c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging a common tactic of embedding numerous links within a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://efuturesthai.com/uploads/files/kobusofefimev.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210908_C6A2F435F2A58954.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/babefomud.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tavewodi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/kamepememetugam.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a131cfb21---basipijemenujepusoxin.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/33209161214.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/fopexaxonefope.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b97145203c---piwidak.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3220243853.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kurojebenalovukunugat.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/92220500465.pdfIn PDF document text
    • http://flexa.cz/docs/file/4901454195.pdfIn PDF document text
    • http://meditopthailand.com/file/13628630748.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/gogodoses.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/80274921530.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/59554931872.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jvhuckusvh6rsechjjdf9lc9hv/48806779023.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/nozajupokukilel.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7e9ddf8355e21143fd1a0b9b309ac467/53720009686.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e815d62ca---gofirokobaboz.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lijore.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/mixoweniwodisaxufotuzirex.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/mabuseseputibofivonip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=h+se+wordPDF 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_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 19596 bytes
SHA-256: 8ea0b22956597acfc625401571232d0e36e559d5c89e7c4769bcdc6bee0e5261
font_01_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 9816 bytes
SHA-256: f88abc9feecd8b70af91f67d0b0862476bb9442623be2def18a1437b31ecb6fe
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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