Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd4456374c908ea…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 04:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f022b402aaea085cc20a336f56648873 SHA-1: 665d2e1da7b1091e466fd95d318d72a367571ae8 SHA-256: 2dd4456374c908ea5146fcc4d99860759f64aff341faf57242f4181f6e4d67da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=sha1+flutter+android+studio PDF link annotation
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jeliso.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/26785459360.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/moguxebegulenig.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/30489860516.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/84833781679.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/39110828275.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lonir.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4c6a9f4929f486431ba5c7671be7b81b/42254257152.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/6319248355.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161491058049b3---15689608328.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc425a6e1---44087906087.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356f6b3c5ff---guluxajo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ed1dff48---92520008030.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/74956159757.pdfIn PDF document text
    • https://superchills.com/userfiles/file/14919653388.pdfIn PDF document text
    • https://bunianco.com/other_files/File/biwugukuvilalenanavabuva.pdfIn PDF document text
    • https://kopari.hu/files/file/benigofujalakane.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/35680630887.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/92406111323.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/32613295289.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rii10ccpdbtasp7gvc1a264nru/24186180212.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/7558630387.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/36559823856.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405b894d6ee---66204391554.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/raxavosod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f618.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF618 16456 bytes
SHA-256: cd3c6f303c634d112a1759aa68e5d7f1b0abcd613aaa10fe650ef35aba88a851
font_00_sfnt_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10676 bytes
SHA-256: 1d00fc3ea9027e0272b16620249a4ebac307c244d229af60e824d1805d94f81c
font_03_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 24352 bytes
SHA-256: 75160fa24e0561afefecb7051156b0e3f22e49e7413fa4009910b7752bbb9dd7

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