Malicious PDF — malware analysis report

Static analysis result for SHA-256 4274f9299b5fcebd…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 14:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ab3e6db2147c977e66f56ae2c9c702e SHA-1: 49f036ac0bd68d044b37020b8159b88442ce3615 SHA-256: 4274f9299b5fcebdb12da9b8ee3a455254fbd5a17c1d4e960a801ca635cd0cb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://smidgel.ru/uplcv?utm_term=visible+light+wavelength+range PDF link annotation
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sekinezajagofawowize.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109171903313694.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/43623989954.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/25018853737.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091011100634.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nubibimuxus.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/53702872051.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8f100ed36414cfacf322c0a56daf5e30/84811008263.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/83419471897.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/17588495739.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/giwogar.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/radiwifaximamurox.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/96872237328.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/88998735382.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/42843724181.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/4077640376.pdfIn PDF document text
    • https://kultmotor.hu/images/files/13505202040.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mojix.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xedopanazirozikij.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba5d7e12a---mekufibexopinazuz.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0a07db2812f4456a37ad0245dcd97b3f/pesulizifegofon.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vavanizuzipudigoferugopen.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/61040983103.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/33932545124.pdfIn PDF document text
    • http://saaretravel.ee/images/file/ruvemenarorare.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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10528 bytes
SHA-256: c73c9352cd5fdaa71fa9214f7904284d4d398f94972de1b4c4368166d44af17d
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 18084 bytes
SHA-256: 10e9388eed43b0587ba262ab86c18bde3b9979fa83291d9d1a293b3ee1034da3
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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