Malicious PDF — malware analysis report

Static analysis result for SHA-256 0def7771db7ec26e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf8c8880f4772bc86b0e6678a71bff1 SHA-1: ebaf07a83525b0b7c95e2a76f536ccc42b592252 SHA-256: 0def7771db7ec26ef1a27322ce3171092fb415f19e1876bc7f0fa49d5f7752c7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://taxicityplus.ru/userfiles/file/jomolapi.pdf In PDF document text
    • http://szjglaw.com/uploadfile/file/2021072103462873499.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e18df772f21ba52f0ad54a219acf891e/52109079538.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/97990827367.pdfIn PDF document text
    • http://ruihuitax.com/files/file/padiwogewepowikodiwes.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/58d9a1b40c53c25a53846c0fa6fb8039/jozigogazoxogafefipumege.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/62034152521.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/976920c3360363dc1682f9ef820079db/52667739200.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160988aa364271---leduz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb8522a118---pugezulotunalawokelas.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd123c6167---pilejuguzetareroziwubowaz.pdfIn PDF document text
    • http://normel.org/files/upload/file/zewakulogixajinirunibof.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e9f3ab9d4---79755004706.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4789366fb82b31d99965672055320e9c/91946447552.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/215ad13c3f226c3ad377515362f5c93d/6066642996.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/dowewopuzudarij.pdfIn PDF document text
    • http://renovator.cz/files/file/bazanedenoganowezusara.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/zitorotuberevok.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/pupodopomaj.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a4qnpilomsdufu5nkeff8qt93l/xetijurakupewogatudike.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/47988238879.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mosovumasil.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/32999789611.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd505a1354---kaxiseritu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d946e7fb---51511777194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=prepositions+of+place+in+english+exercises+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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 18232 bytes
SHA-256: b228bcedf9908e2c9bbee2fdf856c6b4bf5abc47409520eb1566cc82e81c6672
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 11000 bytes
SHA-256: 3db4ca77564962ee7d193773e38a0c25dd31431a6eb8592dfdec3abe52007d13
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1