Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a399837957f3312…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 03:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42639a64c349238c4b63550815bc0825 SHA-1: 628c275111fef9a6b71c9e1efec1a327dd3bbb30 SHA-256: 9a399837957f331269fbaebd7cf0f5b57dfa73ca871b685a6ae9ff3b599b7c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=bike+race+free+top+motorcycle+mod+apk+download PDF link annotation
    • http://donghotam.com/luutru/files/nuketogenigufijipap.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/84090902681.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/digotere.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/xizasirabebezajobule.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/selidavona.pdfIn PDF document text
    • http://rilta.net/userfiles/files/futonoxonifov.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/98249196755.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161316c8210ad3---8569980227.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210907_D8987B22DB30C14E.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/65a089ea90e6181d0bb646823753dc55/84801354019.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/87849956002.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/93293187454.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ximimiletuletarakumowo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/21690934373.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/pevigeletujopojubiku.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/78012967645.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/46450592093.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/43005762821.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/45285815138.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/82316902673.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/67664261764.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/fefikivowigulugof.pdfIn PDF document text
    • http://mosjob.ru/images/file/fazaxixadulev.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614fed4673fee---77171758428.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/puzimojodenukazivib.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210924233414_iiegrl.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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 10956 bytes
SHA-256: 69869341d798a522db9ef889c50698606eff22af693c321138fc3a1af197be72
font_02_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 15100 bytes
SHA-256: e8bffb254c5ed905ea484e4258fe11820b2b65b1d36ba41d3b8271f180c69b46

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