Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ac44cba0a91730…

MALICIOUS

PDF

192.6 KB Created: 2021-06-23 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c1fe24da4ea49ac9f06b54e9feb56fd8 SHA-1: 5af7a186974ff6d27bdde53a720f93f21764b141 SHA-256: c1ac44cba0a917307bd8b4b3886e778cd690204ab750771ced7789c5237c7ab9
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised or disposable domains, designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, suggests a lure related to an "evolution guide", likely a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://silesiacapital.eu/data/file/29798045831.pdf In PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/36c403dd3427ddb1f1c23b1f7fc62e9b/27636246555.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ka1fvrkj1g6r1d8bmmj2mr1pe1/jujipugoriwexazevojija.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/86167446765.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078134909561---zurubaropebesekinogunu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jh0fa3b3oqj15fbkg03qr7d9om/wepivedunu.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xisonetu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lagijejup.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4e4fabc1be71d31ececbb8f193a43755/62719808901.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vakonu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/19918238573.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/sukiwirivuveserusureboka.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4rfu8eir1f8k7ve2fej8mgh428/72063730463.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/53924745e1248cdd628476b8a22b8c13/26798068000.pdfIn PDF document text
    • http://inistor.com/ufiles/files/63774981431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chrono+cross+pip+evolution+guidePDF link annotation
    • 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
    • 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_off0002a4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4BD 5092 bytes
SHA-256: f40496609a9a1124875e0a025a24e559a8421fa50e1e4ae7d7d4d816bbd679f0
font_01_sfnt_off0002b610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B610 11500 bytes
SHA-256: 700cd2a11650b5685056504f2856bf8a38f202161141840b33af06b65e9d2ff6
font_02_sfnt_off0002dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD86 16196 bytes
SHA-256: 13873d145b8da2256cc9aff7ec32aedf7dd7de0e65fabb376e0f91dd1eea3996