Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac8edb2f8522cf5…

MALICIOUS

PDF

75.1 KB Created: 2021-10-06 07:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4aa5060bf4bcb92bebaf8e145d24a2dd SHA-1: cd00cb0395dc1856b73258523b1c9abc4dc7f0d5 SHA-256: 7ac8edb2f8522cf5c5fdb606e763e2faab68804686f01a497c953ca0c95cb65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=df+command+in+linux PDF link annotation
    • https://tenshinorchids.com/FCKeditor_upload/file/94348751367.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/foludago.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/0c7722d016c7cb59791f6d7371575d77/xaweve.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/rolezadiviwuwidowaj.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/61445872163.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/lafuxokipagaxoxilaledu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/foniwofiza.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/rosadusiresagodabojukuke.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915153427_80twbz.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zojamodepak.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/20683371570.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fozizu.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/fokidivofoberubafusi.pdfIn PDF document text
    • http://apex-architect.ru/images/file/56689703513.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/sinuj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jitejevonun.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb113e010f---wawidotuvosuwagutusiw.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/1052210334.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/28104053322.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/nusopemedudigijolusu.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/fixozawofurenokudaba.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/toped.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/bivokudi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ce83e48544746dafe4534f9b779b0410/farepatilipojawetezo.pdfIn PDF document text
    • 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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17040 bytes
SHA-256: c95d90910e7fa2b474051b39a76fe4561d5d5ecb3d8e1e1788c5b692d69de7ab
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10344 bytes
SHA-256: 7e58508712a07295b4873f7b30d56d06d3e2b94d9d01c9af5ac88fea087613f6