Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70a86148c870a11…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 19:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a94bedad2be3a34393b682937d337ebc SHA-1: 7cf47a32125eb047d63dce41cd1c49dff8569cbf SHA-256: a70a86148c870a114f884faf6fb488d570eec0850c720a30ecf5df042971c2e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=mashup+apk+for+android PDF link annotation
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/muliwetifefubu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xufowa.pdfIn PDF document text
    • http://hla.vn/upload/files/voniz.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zosagukejimojukavozewised.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcb1d8289---vufomasapexewivejibarelel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed17bef35---garewovamepidive.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3a16f11f---wejekukuxenejobor.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jitabilirugufozeluruxoja.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/demuliniwisibenop.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/zozeza.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/worubiwubirefijibuzozo.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/96656285477.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/25522634473.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/20499067422.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/winalepin.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/vudefi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131163939629---45667022002.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fukusilomoxudav.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/44951432344.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bazibirat.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/78952201163.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/97d541f107ae7b6211df381701102284/95657237488.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/fisebis.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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10504 bytes
SHA-256: 416eced12a017d74d577da72ec28d5aab693ee8943fbf2ce9cf9fb86c7faa057
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 19232 bytes
SHA-256: 6d20622126f3ec3f63ab84a014e012d65d14acd92f2a0accfd601f3f2f017e62