Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4091e2b87087a2…

MALICIOUS

PDF

76.8 KB Created: 2021-08-14 16:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6aa8dfa0d7a21f0ad0519ba265eb5869 SHA-1: a39522c8c9a4274d3dbaae2b01da6be036e23de2 SHA-256: af4091e2b87087a2544ca317902fed372f1fe01c6cc327865b8398bd5c9f749d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://aplus.to/userfiles/file/29924852536.pdf In PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/70004198902.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/54676689533.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/31249966176.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/busoni.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/tanenuna.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/pigodezajolufigefuz.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/vuwosebelemugajeli.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/kujasurifexozidim.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0da15296---95450352468.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736714e0f67---34809797643.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/94487319639.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wupugu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afb68b69426---saxirotojifulefe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e98193a2c---kelimenufavitil.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d80e25c0d---39596519335.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8e3743c6e2097a29cf106a55b0f41150/17671301569.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2d24842759d7367f59ebb38287bd48b/jesivijovufopun.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/753b4d0680f34899f35e809877fdf336/66616072898.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/789b61121a9c2dfb1e8256769fa2fe45/21268683278.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/87074402739.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21806393621.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kevijuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=santa+biblia+reina+valera+1995+edicion+estudio+pdfPDF link annotation
    • 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_off0000c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43D 11348 bytes
SHA-256: 079f49e711500e51e546195fba058d213c87470eaa86ea04435c7c1f73c90371
font_01_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 17372 bytes
SHA-256: ff29b6d3afaa1a79cff21627a5ce9821afb8a6458b26b3975088e92d78fbc12d

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