Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c57cc569483100…

MALICIOUS

PDF

76.7 KB Created: 2021-06-08 21:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 892d45036a2268d0bfd2bdc2fbea0eb0 SHA-1: 218788102f1f3eb75c5e997edac3e659c3524d98 SHA-256: 75c57cc5694831008bf8c30bad9b0b433775ef650d9170dfb3772f57243bfbb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to 'pubg hack apk unlimited uc', indicating a lure to attract users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=pubg+hack+apk+unlimited+uc PDF link annotation
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9a63f7b047b3dde582f84df355920a86/32680743474.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/iqaac6jcg8qo9nlp1fj0asmmq5/lipalurisafigow.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t834363e25if6gnqr7fcjsh2tr/78537203402.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/sn2j78pqnooo1baokpugq35vcv/22265689817.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f630b7c0---12856205090.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2e30061475ff4734295a2dbc3717dfa6/90092470235.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/22850225998.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abcea3262f3---66807303292.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wobibavibowozipajoza.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/781cefc8cb25afc46db7d4f860b1265f/84481875790.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8be9ab498---xejal.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/45ae5341011ec0533cf4cd850c27af7a/bifekunabujisalapupamo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b090921b565c7e0795e11d1d7928ef69/vekejat.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/mefidebokunuwomone.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/wedas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 5420 bytes
SHA-256: 9c3a47eb997d52d66041021aa931815fded50b746a1a3e25ec04d607904f9ee5
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10952 bytes
SHA-256: 6f0855b0d42db154bfda5cd1c2ef9bc835d6114c9733af3dca03c9d8cb7a567d