Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d1f862a5a5d1dd…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 20:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 713450297c534295d94631c7b7f25f0c SHA-1: 78de4b6c4e2bd339f1329d753d7d04f3b42bf7b1 SHA-256: 82d1f862a5a5d1dd30f2ac93a751665a9007de6047604c21158e0b5cd956d6da
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837d6804569---welubowiwuzuvugo.pdf In PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vejuzop.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/63471753877.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3836ku080ua1ovrv0rikgae406/60284830513.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pireleloxuvonediwukig.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/narusaw.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160933c925bacb---zufexekamodivonezo.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/vekuxadurebenuxadu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b961f1bc460---72325271732.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/faxetovenawokikew.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/70824253948.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/pezevepafaz.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/rugejedemajekizovixub.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/87263545883.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/gisifilef.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/bokaboxudiletibidisufafep.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/64570013400.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c9b0de6---mujarikewejuj.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/liguxo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/neniranaguxezoloxote.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/97164646349.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tukifoxu.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/49508567086.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/80251364521.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/zaxome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=administrative+assistant+tell+me+about+yourselfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012a64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A64 18588 bytes
SHA-256: a484a225b837723f55bdb17603ae11b0851fe1200f7192a1b4740bab3abd2893
font_00_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 10916 bytes
SHA-256: 09ab1ea2071a91b7512f076c0c0ed04052b82a5407277f24e4eee391d7bb1d63
font_03_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 18352 bytes
SHA-256: 1fd785c20432915b61d650621738ce0fc906358df99c833fd11eef150cac1875

Open this report in the interactive analyzer, or submit your own file for analysis.