Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1a05f1caaeb53c…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 12:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5652ca16e2e5afaffcc5b76de68f0784 SHA-1: 683bfab1d4eb32e35c5b772dd570f288beb5fd47 SHA-256: 8d1a05f1caaeb53ce6cc48a3cab40bdae03f387f44734f10ad57ce17173a504a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.mueblesgamez.com/ckfinder/userfiles/files/kopupava.pdf
    • http://creaorganization.com/depo/sayfaresim/file/tutag.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/luzejukarexexudugewu.pdf
    • http://linklandhotels.com/upfile/editor/files/dukiguxexote.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe51bb775---lusotukol.pdf
    • http://dailymaytrogiang.com/userfiles/files/68645672386.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8l905jdh02oa1k03t2g30vifvo/12281645346.pdf
    • http://robwalker.net/fckupload/file/bipapifidawoxadu.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f574266f906bc9281a9e6c62c4f6874a/xemagaroxumubexi.pdf
    • http://jhdjt.com/images/upload/File/xoterokovofa.pdf
    • http://novussiteyonetimi.com/uploads/file/rafawibalule.pdf
    • http://consade.com/userfiles/file/4998386017.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130f2fdedfe---bofuzexibokokujogi.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/62244512069.pdf
    • https://fablab808.com/nbloom/fckuploads/file/92114914552.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8mnae48m30jr4aro79nonkb0e1/sutetutakex.pdf
    • http://www.jindatunnel.com/up_files/file/segapixibafejivedapu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bb5a29e2---lanepuxegumekufifoferat.pdf
    • http://0575zl.com/userfiles/file/49400188676.pdf
    • https://hamasataccessories.com/userfiles/files/36609740619.pdf
    • http://batterseataxi.com/survey/userfiles/files/61864738690.pdf
    • https://proartgaleria.hu/files/files/rusegumesizedapud.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/derupegi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=particle+moving+with+constant+velocity
    • 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_off000106dd.bin
77a2f1aa25bcf7a13718d11228e98ef64ea09478e65cdc62f93443a48892eecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10944 bytes
font_01_sfnt_off00012020.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 16792 bytes
font_02_sfnt_off00013832.bin
0f5734fafa617039409ed97b3ae20b752171939d251263852382ca2dac18e666
pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 19084 bytes