Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f918ac3658c80…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 17:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfa61d29ef159f609e454ba06770194b SHA-1: 2c068f0ceb8b3295c4ceff91ee7dfc5685e1faea SHA-256: db6f918ac3658c80c0a954fbcc9922025754629867e7c9bb3705c02591f4cd55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it may leverage PDF-specific JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntland.hu/upload/file/33494004518.pdf In PDF document text
    • http://kdwatch.net/upload/files/2021090406010873.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/ralumiwonubelamoloso.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/nifosinopazujajilexa.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076044608b9f---babezotudu.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/4169352502.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8cb89476---bulagukigaliseriforipan.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e287e800---22370687025.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6i9me62si52fdfs3v0di919qfr/85841845348.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/3038091501.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc229c97aa---ridibes.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/durulotoxezekox.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/gimagimamibo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6f05dbe8---sesiz.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108071700587042.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097e6ed6a30c---78027576236.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/sipugipetipukezesuk.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/10459826908.pdfIn PDF document text
    • https://digicpictures.com/downloads/wijijikixinakajib.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/ruxigovirojuvop.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062316432992.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/3060267164.pdfIn PDF document text
    • http://tochuchoinghi.org/files/wekimuzinipopefelonagum.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/remiferinibipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=critical+thinking+skills+assessment+pdfPDF 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_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 18248 bytes
SHA-256: 76751bc6f50c15e174bb4780bb033d14e37f660cd6aa9235c637556bfecd0e66
font_01_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 11068 bytes
SHA-256: 676e781f1fe17a42a22ad78c4bfc0ba92633b716f36e32e5b39f1a088cbeae33
font_02_sfnt_off00014fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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