Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aff6468218b454…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 627c9b10e2c64d473632abcf2a7cea22 SHA-1: f3a0d2f6427bec66804bbcaf59428c9f14b11399 SHA-256: 77aff6468218b454d95492914a66c77656d135013fcee49af113d3df0a2863fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on what appear to be compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and link farm nature align with techniques used to distribute malicious content or lure victims to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=mis+zonas+erroneas+pdf PDF link annotation
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/69425900622.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/wivikexebowotoj.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/tiwigimoredoreruxov.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/21695655532.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/14215580160.pdfIn PDF document text
    • http://chromoink.com/updates/file/31163506523.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/31627489015.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/17377128060.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/vosokozitobalotexonape.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354f215ed8f---vezixufafovo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/7589618810.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/kibafes.pdfIn PDF document text
    • https://eventaipei.com/upload/files/48777775530.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/56413850215.pdfIn PDF document text
    • http://vecsecity.info/editor_up/peduwunovabisedokixuji.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/simogak.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cc213dfe208597b65815b5d6d171d249/dugetexuvarij.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe015d270d---71659678806.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7d6db69d---sejoniwazaperena.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vudakunuwosusi.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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10400 bytes
SHA-256: 8e5e9dbf76e0af8364dab49fae2cab1bba925f222567aaee38a66495af60d38d
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 19904 bytes
SHA-256: 972e99d3d7654938df50f4766afbeadda873733f37052fb5e5d3e9a5ad625759