Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e678372343f2eb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 08:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4a7a375a129a997a5840b4183cef83a SHA-1: af48587cfdf7312dcdd18121dc81003e17d26354 SHA-256: c4e678372343f2eb969ecb9d7e0c944e59577d90301f0c5764a1abd157e92db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=galaxy+a8+custom+rom PDF link annotation
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nvtnj0tpfd7jqibo8qkvb651up/rajerasamotilipuwuk.pdfIn PDF document text
    • https://biomisszio.hu/tmp/40987188797.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/68456329716.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/vawesobibiloz.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/96456568489.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/33679642605.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/nezaguzusodetit.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adf2009f9988f953a8c82e57aa747b87/56916214172.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/63990732728.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/xizawamugekevodekubepaj.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/80101415795.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/857041735.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/79457069122.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/guqdif8g95f99mmsq31s5he3vr/xovuxugotugu.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90787778052.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/botisupejopugulalajafinit.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/82243491106.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/90399042916.pdfIn PDF document text
    • http://electric-kernbichler.at/51276696453.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/31068428717.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2e55881e---73398144321.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/5854479246.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/mugikuwamamozuxufonired.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/lubemikewabe.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/3563679503.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/86526914337.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10624 bytes
SHA-256: 067c74eabbe84a94929507b848fdcc42d52887429e49c3175f67f725aac6ae99
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 18888 bytes
SHA-256: be30235e233405ff488c52e9684dd571fe880e199ccc996da1144b4e3d4e94ea
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1