Malicious PDF — malware analysis report

Static analysis result for SHA-256 934da9e215836acf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad8b625599b54ff5f8baf89a174e745f SHA-1: 94026686b52ccd65c841c6aeccb0afcf436f2752 SHA-256: 934da9e215836acfa894e2b7cc954be0ee3f327900937b3833f4c000e9fb5be6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=verhaaltjessommen+groep+8+pdf PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef108e76a8---fositobid.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17d51f1f5---nupuvumixe.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/kudoxitunuzi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b1bda213117742201c9af53c16917ba9/solonuduvarowaf.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091de139b849---78510737661.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/13369987178.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/67080264281.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/46249617627.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/9764867296.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d18478ba03---58967335489.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/88682847108.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/72740424584.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93b800ed75---35224629722.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/feb567f1554ce4e7965d92a8bacf5a95/bopalonitevabizirunesef.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763914c3d3d---danimikinikob.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffc15c27d---rowizasekotafe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160901c598fd98---jixatulixuxufixudinevim.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ec5ec9b1---zobavi.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/50681090816.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/65098168792.pdfIn PDF document text
    • http://mp-journal.com/media/file/9769102649.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021681111347121.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_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 11160 bytes
SHA-256: efa03e4f00b3424d43f7cc56f4eab652ec0b71d0a789ed668af5a749f4464cf7
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16480 bytes
SHA-256: 41e138fd751e69f504e9dae56652c11a60a8036975301861377b2f728b5eefae
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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