Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92d6e3b002ceb77…

MALICIOUS

PDF

85.5 KB Created: 2021-08-25 14:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d155e6524b1674e6bf075145ebe3ae01 SHA-1: 3cbdbfd0d878f72c4d73ce996bd7d970a8fa6ca4 SHA-256: d92d6e3b002ceb77c7cee8ed3e9cde46a3deb0515c6690196bd37c33e49ce480
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it is used to redirect users to malicious sites. The PDF's structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=is+there+an+age+limit+for+american+idol
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d8a9b496---gopiroxiwimetobaloluri.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d89e18496---27184354136.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49e6e2d5d---2009087229.pdf
    • http://ride.hu/images/uploads/files/76102093181.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/11376976208.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f827d59e3---xepisezusenetewog.pdf
    • http://htygroup.com/upload/files/21779576943.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1f2td8i5e70gg95penqfht4l1b/71848528902.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/46ab809891f8c3ddc013b31ba7dedc4f/zajetosekugufaxanubuzep.pdf
    • https://thucphamtruongxanh.com/Upload/files/53887438014.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/fadonutoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba30655cfba---dejevipokudaje.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856986465b3---luruwatedimewagapu.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4d44fff257d7ff1fe334ec57734d3cd1/39627253473.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097cfcaec8cb---dewejawanerene.pdf
    • https://kanat.com/upload/ckfinder/files/mugux.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/kavojapatugipufudinore.pdf
    • http://nhactheducthammy.com/upload/files/tuwudabukiru.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/n0nb9l7nmqffck38rj99aau9a5/40565944489.pdf
    • https://www.rougeindigo.com/ckfinder/userfiles/files/85932411431.pdf
    • http://grandviewgroupresort.com/upload/files/jabonowebekuwudotasobel.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/dikegusomikidurisena.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/6912387842.pdf
    • https://panama4d.com/contents//files/20421562290.pdf
    • 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_off0000e7e8.bin
5b6d8b91f18cabf35fd144fab1ccd6609db1d66e35329942dc5ecebfaad29c65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10876 bytes
font_01_sfnt_off0001009b.bin
0a0e017188d3fbb06f40456a5ed621012c9a395605a57304414d5927c529eb96
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 17420 bytes
font_02_sfnt_off00012ddb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 16792 bytes