Malicious PDF — malware analysis report

Static analysis result for SHA-256 418103de16ed2c5c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 01:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03e53297df944898040f9b87cc7cf77e SHA-1: 4bfdf8f5c3d6d1afb7acc41ec174a6ab5fb15dc4 SHA-256: 418103de16ed2c5caa71bf3003648d0d98e67e35b6ad3842df7f20dd882a3c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload, likely delivered via spearphishing. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users into clicking through to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=friday+night+dinner+season+6+watch+online PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161331126582f9---78191274819.pdfIn PDF document text
    • http://tradotel-riviera.com/file/86071494754.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/94771119340.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44247aeb21ba919a26f6814f1180fd92/wiwewejanel.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f1251afd0109e589c4adcc564f622845/nenumaxoxoxob.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/venofomusoj.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/59562257572.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/vevup.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/99086245775.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907122701.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/23788912622.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/renobakepebobig.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/buwokugesizizetedinafapim.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/tivapilidifopar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ad38be5d---37089464839.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/48907175233.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ad7118d3---66809948115.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/96756007311.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/delusir.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/rinokabasali.pdfIn PDF document text
    • https://actorconseil.com/files/file/zebolopegogitoz.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/03/mufekaruporenunijiv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829e36a61---66460255959.pdfIn 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://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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 18056 bytes
SHA-256: 7c5544331aa129ffccc847e8bd4ee87ac8b0c35d41fa0c0952cf9b989f7958b5
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 10992 bytes
SHA-256: e59f5cdbc5185bca7f4a14805e59c3ee844696bba06b60765400c01c0c5d4937

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