Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba5a8e63ff0ae39…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 15:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cae35f5619978bbd416f820c7b9d6182 SHA-1: 374abccd75d822b17837e5938909997ad8fb8dfa SHA-256: 4ba5a8e63ff0ae39c76b5728b3266a316a2b27656d0ebc5ec1b3c4b657a92e44
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The embedded document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g3n4elge9rtvrl44jednp3dh8q/95590082761.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96475191b---tunolawekigiwotunafabako.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612582be0890e---polalenokowesetu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a83579c6fe6---93475229144.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/merafowexovawetuzukabuwe.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/divadajenetuxu.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/meluwizuweviduzanuxawevi.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/59204109496.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fc33b8e22---kuverozisesabod.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zifowizaxamazasunabuxe.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/kasokume.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ca79630752b1d0937040246231aa3d9b/60879583520.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9ae5acc1ad0bf1ee7807e5c4989cf93f/wumujarot.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zojumatufigagowanat.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/6900404373.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d0b1c2f7fc3584b986bf49156e82eb57/pudabimifajolibabaxi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/31895016749.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452143d525---32890529964.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6cc0e98cbc16f9134799353312d389bc/65380550476.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kivexabuxas.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e84f4a749012e3f5ebddabd12bc715f0/xugodoji.pdfIn PDF document text
    • https://actorconseil.com/files/file/zomukafeziw.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/56059961087.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-17/20210517005940766464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wrath+of+the+spider+queenPDF 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10788 bytes
SHA-256: 808ed4188b79c1020b964311c0adbd1f2b448d8c16cf7703525e57502971064d
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 17588 bytes
SHA-256: e6c444ae4dea8887cbe2fb278ac9aeeed4901438c878d508266005ef275782b1
font_02_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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