Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b0536c0540839f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 11:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4860ea0211a97155eb5d20c411a65478 SHA-1: 7e036f14cd464d840686d90fc0ba4587a69f606e SHA-256: a0b0536c0540839ffbd092974ed37f533dd6ff348e1b353d8ea38901706d8cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=baby+browning+extended+magazine
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e032f9cbdb25163fb516e0f3751cd2ae/62979261996.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/53e9fd94c19fb16b8d5ac63eebc926d0/37781955324.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfc5a925a---25280731666.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8fd0qg5gdf4qj01db6sds238t6/32330111625.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbe1d45f9---46791230820.pdf
    • http://schodylux.pl/userfiles/file/zezewoxosigenisurivone.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tgurnp88pjl9dr4ovs0qsn5qs8/vomanibojuxu.pdf
    • https://vigiweb.cl/dinamicos/files/file/55620132725.pdf
    • http://mackyz7automotive.com/js/upload/files/lamexixibigemogukojix.pdf
    • https://dvg.asia/ckfinder/uploadfiles/files/ribabutamotufi.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2d7c64a9---jowiwezurexififupukoka.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b63591b8c---56206051764.pdf
    • http://yesilderecine.com/admin/editor_resim/file/28589164118.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e1b8ec42e02cf5dffc15d7e4a00fbdc/33524818038.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/38147053109.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5b9a922c65f094690bb5aeb1cf8c1e93/pibamijoxozalepagirumi.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2og8cvmp33bi5kiscaed3u176o/57316357462.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b049eda7---77909716112.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/79cc6d7e779545ac3a33b30f6f3e003f/34729203215.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861e07e2aab---bilozimapazab.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/50905953b3c4fe5e4c8717823e9ac028/58605833013.pdf
    • http://smitheaster.org/clients/861344/File/60701001783.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3d833e9b9bc1128915d30c87d289f9c7/xobufesiwepixexo.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080724466e9c---bejujizuberobafutom.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
font_01_sfnt_off000104a6.bin
bdc8cfc024e45ce837579964247714c6d1bbb5858155574f8a89a03448b7630e
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 17120 bytes
font_02_sfnt_off00013183.bin
27c65cdc0641fb660dc0f32d57588a607789813a7da9df49479595edc193db90
pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 10932 bytes