Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ef3ef0ac84db90…

MALICIOUS

PDF

88.6 KB Created: 2021-09-23 15:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a704574e8ce4b40f7a8f4c44b5f6953 SHA-1: d33787ee87d30426b7f33353405a8e3669bd0fe5 SHA-256: e9ef3ef0ac84db9003b23237bf4c77d6c21506cf28fffee9d06a435ba9809f18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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 https://cructi.ru/uplcv?utm_term=g+minor+bach+sheet+music+pdf PDF link annotation
    • http://unityproductions.com/upload/files/88941045453.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/vajebufuki.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/gukopiburilixizokoxa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613400903a9ec---tujolesafewawow.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/79795004983.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/borabewurozuvugoturi.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadaj.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/16007534041.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/nagiduralobajomutiwan.pdfIn PDF document text
    • https://educhina.mn/editor/files/49768596918.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146285b7f370---bunagusafubin.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614c459c4f491---81899494290.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/82494888377.pdfIn PDF document text
    • http://momsystem.ru/public/file/94817332604.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/07554fbe46e378c21152fedb5a932a5a/toviwi.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/zemavar.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zesefutijojuw.pdfIn PDF document text
    • https://gyvatukai.manovonia.lt/images/files/36650897838.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/dufewi.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zapafole.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/mavabosazejob.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wikane.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/51587021134.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/71288746975.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 11116 bytes
SHA-256: 34abd438f3163c354f943998602f16ae3c1f0accaaf579a406700c5264bdd560
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 18928 bytes
SHA-256: 7fc776734ad5b36f1df3b2b2613c6f60223af505a54c7cdf6734a680867c9f4b
font_02_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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