Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b51c6caae788f96…

MALICIOUS

PDF

92.0 KB Created: 2021-06-25 19:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e084e695e649abf8b619fa7b4ba4e69 SHA-1: eabac35a2266dfc3e0cb0dac9812773a6d4c5b04 SHA-256: 9b51c6caae788f96765f374beffe126833db84bc20c7c30628ad34b578fe76fc
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms and serve further malicious PDFs. The primary purpose appears to be to lure users into downloading or accessing malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://cructi.ru/uplcv?utm_term=comparison+and+contrast+sentence+examples
    • http://aksaaydinlatma.com/img/editor/image/file/diboxewexigaxojo.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6v2bgi1ni7e2n0j2b20r9snf2a/gubolijedurawevowepol.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c79e2b63---41465070582.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5rbejl72qfansmd3b9ka4m4et2/81214740416.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a3b78c467d829c3948261af074c2a4cb/vazoranavolune.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcb143292---65557827045.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b7abce9---30256920153.pdf
    • https://alkirbilaw.com/userfiles/files/xijavobisadi.pdf
    • https://kovosluzba-praha.cz/res/file/rolekofubuladomul.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bccc45c426f335d2555e0b893dbb4d89/netofovufajopametovotiri.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50b25ea37---kezozudipurazinaduvi.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1818226f4cfa8e7fbef3fb426119f0a9/detakodomurelopejefu.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0o9ka1cmfngufg9437jiek1c8c/xegepatidirewimame.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d8612cbd---70497027947.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c3184bcf58f---muvela.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/ferudipinarejusevaziz.pdf
    • http://splogservice.ru/content/file/jetulopivipuruwutezat.pdf
    • https://lawyerupsmart.com/tempimg/file/84135997477.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275e970c92---83064760891.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6bd8dcad---70896734358.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cc10qmimcqs0f61jvp7ulsnnvf/folidamariguwozabi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2616fba7cab759549eddca8f2f2332f3/detebujananukanobu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
font_01_sfnt_off000107ae.bin
5839f85b7fb3e1590682259c513d061d2805508e24b9292b9c5398700a161b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 17152 bytes
font_02_sfnt_off00013422.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16068 bytes
font_03_sfnt_off00014943.bin
c432fa59de698ec8305fde8ff3b2bacea88dc0530e6331cead0325e9d4ba4130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 10808 bytes

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