Malicious PDF — malware analysis report

Static analysis result for SHA-256 144055aee7f23648…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 13:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50dd4d94685fa4f4044d07e2232f63d2 SHA-1: 1cdcbc47600cf75c650c5f249c84700cdd31df32 SHA-256: 144055aee7f236482e288cd37cad14d3feb63871996b93080c11efc0d4496698
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=mame+on+android PDF link annotation
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909065536.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/mamojepulapitebopow.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/3168505325.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/6305058383.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/99894160226.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/66356583803.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/31789608268.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/68110786415.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/60941797908.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f618ee7967e7636f4eb3b3a4e97e7e0/9529743661.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/20700544013.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5bfe9a0764c00776742c1ea3dc5b0815/10823647139.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/84422173845.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/binudopujutibile.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kemipubebimisaz.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/50827068716.pdfIn PDF document text
    • http://yibetter.com/data/files/betivajofonadoxabut.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb1048619df38f7e694bad191829c7ec/29996809010.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fp2gj38dei3d2u4kj7i8dornnc/femirusenif.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/39943185734.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/wirukokegunofi.pdfIn PDF document text
    • http://synhbio.com/upload/files/rujala.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/wuxavekutojepisumofuvuro.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/fijiwofovetu.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 18144 bytes
SHA-256: 323f3e7e432b8079b839eabca8d012a586ea2881c0d95694226dbd2528416154
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10088 bytes
SHA-256: 28a4f375e3f520d74d5678e5d2f9f73d18d93851eb3f283a166691c4d2ce0939
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1