Malicious PDF — malware analysis report

Static analysis result for SHA-256 103aceaffa91ae3a…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 515fb26ba47b5d3f660078df301b537f SHA-1: 8235aab2ea774e3a5b705ad56a1a87ae639d50de SHA-256: 103aceaffa91ae3ac21141cb0893fa17b8152e5abd21e494a246bfdb90c5e785
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to further malicious content. The presence of a link farm suggests an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://hophamthaibinh.com/upload/files/zodumenabigobi.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/2878107685.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96a10815b---bigasiwazajitudonibovil.pdf
    • https://coluer.ir/documents/file/54782106752.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c34876384---vexeredimijo.pdf
    • http://tyextractor.com/d/files/wagozewajotuzuxulukuku.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1954b8982a---muvulaxepilodejexuzaruda.pdf
    • http://littlepearlspublishing.in/data/eimages/file/gezabufinabe.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8407f9bc61e4798461eadf43f5d1376d/13489512535.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/e65596e8aa6a028e67fdcd1118f478c9/9879201213.pdf
    • https://lemanssrl.it/file/73229531556.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/jexirilewexenopudojivokoz.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/nekadikamoruwefezikafeso.pdf
    • http://drapa-technika.cz/UserFiles/File/vuxubetajef.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e198073b5---90422597239.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sj5esaakbqs87slmj0ubkmjgl5/wugonudunitoxorekuvuj.pdf
    • https://zionapostolicministries.org/uploads/file/rejejogolukuw.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1710f3b2dcac736a4cfbd06fe097a9a2/39541599810.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/92ebd881d6f67b64f2db794e10fc08b4/42840742883.pdf
    • http://tizianaiberti.it/userfiles/files/59864330490.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/16587053298.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/nafasematozotimugozaka.pdf
    • http://penzionriverside.cz/files/file/ropojeponapisobewonune.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b0e5c4i95gur439a46349jo9bu/gegikegudevi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=zombie+3d+shooter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
font_01_sfnt_off0000e985.bin
c6b10517bd3db3131804b304f9a5b5d9886ca8a0f0fe3a86ee51f96d4e6b362f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10476 bytes
font_02_sfnt_off0001015e.bin
7c37da16a4e9665ac94a5fcfa6cac793a8fc8673bcdbcc558217c3fdb2962b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 26128 bytes
font_03_sfnt_off00013864.bin
0a4f45ca35490f1796084ea6d97ca1a4a36387197472668db154df97085ea45b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 1696 bytes