Malicious PDF — malware analysis report

Static analysis result for SHA-256 c936b330454bcebb…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 07:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a46376d69b993fba5152716452a091d4 SHA-1: cbbb3e32ce447998c4da0b0f13e0768678ad129d SHA-256: c936b330454bcebbd5083b6ea1ec4102efe5d444336b36196a8396510d330e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, such as 'inwebjor.ru' and 'smartcookieacademy.com'. The embedded URLs suggest an attempt to lure victims to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=the+walking+dead+9x10 PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa1f3c27f---pazosolaza.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb0fjd39jsqbrrrt0td2f5addt/xejanitodukatovivodasoj.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210903115237.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a40477efb---neverubom.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05c463e56---vinarovikugasutujuferurop.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/danakig.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/pavofitami.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/43259794718.pdfIn PDF document text
    • https://shibbirs.com/media/files/47914822270.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/56di8ic5gdd2te8aqq6oddgimk/58533187187.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/vuzizonoxomoribe.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/28743279994.pdfIn PDF document text
    • http://bluebossa.pl/files/file/37895986785.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac5cbd426---41955959931.pdfIn PDF document text
    • http://parfumland.sk/upl/42868079282.pdfIn PDF document text
    • http://com123.vn/uploads/file/texidixixuzelavinigameg.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210904133218_mpes7b.pdfIn PDF document text
    • http://cityfate.com/files/files/dunomunuxowaxubize.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613379b9c2f94---xomunilu.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/21359608428.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/73274548789.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_D90697DF728A336B.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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 18636 bytes
SHA-256: de1d9289f4022d8a41d0c6ee908a639a256a9f3caf066fedc026c33e479334c8
font_01_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 10624 bytes
SHA-256: 3fb71311d7b7fb280ebf269a2c8dd809e9f32b90060499030fa6cff8fc6653af
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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