Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4b708cc5661c4f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 15:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 375dfef4d95004d733bff50a96ca9451 SHA-1: ae89ffc9f9282438d78f24968b38d8acaed08ee4 SHA-256: dd4b708cc5661c4f8fe0c5ee3b2c6e0ecb408b325d1b667ece89293e77a53643
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://btsoft.vn/uploads/files/toziduwotipibekufelako.pdf In PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/63186320617.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b32db076c0---legapudepazomasekepen.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919142123.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4fb65d525---63206924960.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gikejav.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/nemutanimisas.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/27117586481.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/vupefakedimupafifoborife.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/79152201800.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/98290e72af609b425e6a74b1bdc09818/fibudimilisajulip.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zifafukuvimoxobuxabidamu.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/pikonebutofimazofajazap.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/29274645810.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/40641414338.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/63040608271.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/71125886583.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72376765458.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/32699458513.pdfIn PDF document text
    • https://ratoempat.com/contents/files/nebet.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c343026fde08bdb9ce7b3a667ed79ba7/93572900289.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443b87b26a3---bamovabujepekim.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142894985edb---79209856525.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16569402912.pdfIn PDF document text
    • http://airfa.it/userfiles/file/71594478034.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/10669486878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wheel+of+fortune+apk+modPDF 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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 17108 bytes
SHA-256: ee2bace5441f94f50fd3d0083486162106f1c3afed6946de0fa659afda6902ca
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10688 bytes
SHA-256: b1221b0f73994b46e1b8c00df6ba30e89e1e54b010a3c9442c6485547b2ae99d
font_02_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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