Malicious PDF — malware analysis report

Static analysis result for SHA-256 43455324dd6af20c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-21 12:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeacd6b74a01e5c7ab314ad16815cd98 SHA-1: f8b8f11362f5c685e7b0530e6194c0714ec7e7af SHA-256: 43455324dd6af20ce0772b4040f1f8ac08979c13a35cbd8d848f48a577d1138b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607becd380cde---zesuwupabexowajezupaz.pdf
    • http://amandamaitland.com/images/file/vataralu.pdf
    • https://ratco-hardware.com/Ups/files/28638818883.pdf
    • https://rusepress.com/uploads/wysiwyg/files/tunalezon.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/vafugaxisu.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/45759961279.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0513f2df9f---koxufibo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160772b743cf93---kutuforefikavagaze.pdf
    • https://netiko.ge/img/Data/file/5819649743.pdf
    • https://hophamthaibinh.com/upload/files/gatozas.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/523697f80d91adf7f13062b9e2a2f2c4/53278103693.pdf
    • http://gibkrakow.pl/uploads/files/24142240401.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0610e739---nalofejanodakowe.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/kinubeniril.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/sibanefetabururabeg.pdf
    • http://studiotecnicopinto.it/userfiles/files/gazibobavo.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9b112r3n0sd6p8tc472if88hcq/mikerofiv.pdf
    • http://lovesushiscv.com/uploads/files/60884657935.pdf
    • http://yejida.com/userfiles/file/sazisuwasofotajejafuza.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/uuc13pg0b4m7h6opn7aq4ibrdq/jukibik.pdf
    • http://beloezoloto.ru/userfiles/file/22632439380.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4d11386fff77cfdb1e9f9da59113f920/79871995046.pdf
    • http://lionsmarsala.it/userfiles/files/17789430570.pdf
    • http://filtrydokoparek.pl/img/all/lizakulozemijunuteruxaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=purple+ribbon+pitbull+bloodline
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 16792 bytes
font_01_sfnt_off0000f512.bin
2c7bb749cd04f47abd8d5b8513d35bba8c37a56fa9ed5e2b4e0b2cbce40c38d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 10296 bytes
font_02_sfnt_off00010c05.bin
38bb7b7679fc106b635c2d0aa38d8736df9dc1a8545f269a65daf87a4bcd41d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 17200 bytes