Malicious PDF — malware analysis report

Static analysis result for SHA-256 d058e051c2b5a97d…

MALICIOUS

PDF

81.7 KB Created: 2021-10-08 03:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e0462d2cbfa82b6999beb81f48c5be73 SHA-1: 9044074193f1561353631975e67678658718f5e6 SHA-256: d058e051c2b5a97d3dcb172fc4e5f12fe942c96e2da5aaff0182ce0b7095ef82
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://csc-0898.com/userfiles/file/20210903154810_eeatrs.pdf In PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/98185292887.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/60869194635.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3f5b29c6049dbe95e909e43af8a8f0c0/84530186437.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/xoxuretizusigalatixevede.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/74456080754.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/takopijebosiv.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/96281983692.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/gologufidakumaz.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/72122236455.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/rakupizu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vuvumarizajopen.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210909083707.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/13579534653.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/60837602096.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbf8cf9bfb01aa44442a3afac16d70e5/4447580131.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/37545308956.pdfIn PDF document text
    • http://1careglobal.com/upload/files/19748262882.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161562acfcaa7d---524708497.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/49444127772.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/dajamus.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-24/20210924020538442120.pdfIn PDF document text
    • http://sarvodurys.com/userfiles/file/4648088857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dnd+challenge+rating+calculatorPDF 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://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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10584 bytes
SHA-256: f4dac527d74cdb527c0cbe376b10ce748dc89c26a9dff547c567e93d1eac2135
font_02_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 18772 bytes
SHA-256: 42abde8849271a91fee036be839ec5ce058a90d1003c002a5cc5ebc526a26a16