Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4cf6b2d3f4f5c9…

MALICIOUS

PDF

103.9 KB Created: 2021-10-18 05:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98bedcc07719071f6bd569cf11f08ccc SHA-1: 5094017f3be3b54fc28188e7bc7116de41061d24 SHA-256: 7b4cf6b2d3f4f5c950c4e77c194e8a17fbf9a50e92487ed1efd68b33c176dbdd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avanti-kuhni.ru/upload/files/86387887959.pdf In PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20211014_2AF77576EB1AE1D5.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/rosebupuvi.pdfIn PDF document text
    • https://dukumanis.com/contents/files/paxotejanedote.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3af3a844c---nataluluzefirefazudewebox.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/noxukitukuk.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/togebawitobus.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukumolugo.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/letagorukesemetez.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4796880085.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/15213960681.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4269dbd29---banipumusewisudonipajod.pdfIn PDF document text
    • https://wineart.online/userfiles/file/rizodipirepeseporowi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616713a8b5dd5---48953533467.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/52198939969.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/75450967018.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/mazijawazuxamokij.pdfIn PDF document text
    • https://razredna-nastava.net/files/dokesogaz.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/5363631505.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/62245112624.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/37962076307.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gerofevin.pdfIn PDF document text
    • http://onlinevay.com/upload/files/ranobuvirizuw.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/fufuligujo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/towajixuxezerufudaxemod.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/wotowupatisukud.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68680202419.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=sputum+for+malignant+cellsPDF 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_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 20088 bytes
SHA-256: 43c16eb28c059c8d02920b57212e8ad150029b8ea0d0b868716a46a9e5428a5a
font_01_sfnt_off00015fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E0 11000 bytes
SHA-256: 084d0cd48efad10b4c3dece64be461c3ac710b34e980eaebed9a5c24a1978e87

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