Malicious PDF — malware analysis report

Static analysis result for SHA-256 20db7c33fe889225…

MALICIOUS

PDF

92.4 KB Created: 2021-10-05 09:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0034c9e105d9fa2ff717c6b368ed4ee2 SHA-1: 476fde0a12172af8127d870e4108e0f1f9888b74 SHA-256: 20db7c33fe8892250e95fbf228bfa50939fb89f50a91dc96b28c5d2f3bb4eec9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The presence of numerous external URIs suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://bernardthevenet.fr/ckfinder/userfiles/files/webasupidunurafemumep.pdf In PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/38223653354.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/fijofiz.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/81520875137.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af032b470c---2870387875.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/kimowip.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/boxijatogimuwig.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/29368209034.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/c3b604netp5v2m44t8misptr44/62496567425.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/65881534628.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/perepafazaminewozoziloz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615be4e503e70---papigopaxokokipuxujin.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/41234499940.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/45285650609.pdfIn PDF document text
    • https://kaimano.it/file/24244999436.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sawipuwax.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/piwebaxigesuligipaja.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/razevezurobuvobor.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/serujipadiwimuwoti.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c325f3699693db082b4104e6a8e1c1a/namuxovatimis.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210924_234455.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c5cf1396255dd3f9c0cc8c96b28b7849/65679844668.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a42ce4bbc---vepajagawodu.pdfIn PDF document text
    • https://agrando.cz/files/file/51358767244.pdfIn PDF document text
    • http://erictex.com/ufiles/files/jelugaj.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/58012057944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vaben+tab+10mgPDF 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_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10208 bytes
SHA-256: 1c4374cc4e901249a7a541f9fc5a63c702cfb3650c38954b55d62fcff4b18dc4
font_01_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 17460 bytes
SHA-256: ac30da7af102ddc1a1a387d8276225b38f32379e287d29c5c6a0ba7ab4338d75

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