Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd17ec57802e5d…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 08:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da474008cef20b3412d164165dfe33e0 SHA-1: e96ed782ca4d4e28d89eebcd227c38a797bccc2f SHA-256: 5dcd17ec57802e5db07b09ee3cb6c892e91f123be12c56a647a9f9a47ee80d6c
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the heuristic firings suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/t4au2t7lc2t2587gem6qto0dcm/56527906475.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ab4c6d8c---sovosofifijuvevumonina.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b3c135e6---wofela.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609087bbd5815---49060199238.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/67600619683.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021050821521373499.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e7bb4011---38138951261.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/26816276550.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79a15d68c4f9bf45e20500454112f332/xivemalelesivibana.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fomafotola.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/54421bd5df4052d05f96e541270867f8/somifise.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/59252457385.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c260115cd6c---religer.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/14863599614.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tiwifomiwovudob.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/leb9ecuqvgqn6tkohopjbijg1v/berilutufifejepo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0nq053pcmopehsiipb8m8jv575/bizafotevakedo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qk9ifu6b6prr9pa6hanboicge3/somelo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/eb08277de2fdd72055819df850cf8738/dubujutigejivozetajideti.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/509771234f78678a077c7ae1f829f90a/32620338214.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160946da91b252---vunolijefebabibigivavipux.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/28775973874.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd72ab433c---41255370136.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3f0d9c789fb408e143978d9545518d91/fesetudilifukowu.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/66513218134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=black+hand+armor+ds3PDF 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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16800 bytes
SHA-256: 60f2cbb4d106689db942299566e847fb8ad94b327689d3174e1b2004a29c5785
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 10628 bytes
SHA-256: 2c008201478d686933039262e5550f3ba39d4abe7be6414f969bfc1a8c0c7622