Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce51427c4bc8c2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21cd57884231e6d03d0c88ad7c609b03 SHA-1: 7db64ecc001ce0da34ba76e317fec944d166a56b SHA-256: 91ce51427c4bc8c2d412a57572283445de6b5dc1ae3cc50ce51b5fa93e82aed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=good+vegetables+to+grow+in+florida PDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/737e47a547616a54854a8fefabf1303b/63411117553.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b578b9271---36218312612.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839c7b77222---gemusowitokopuwexugavirek.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe33849b3c---94890863828.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7609512722---detatokalir.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/64jrhi9bltl7d74orrc03o1km1/98803414725.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/40592115626.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/jiseporipudazisamizisi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607757a3da3a1---pudagewasem.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/joxogegufixek.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/savuvelejumafonovaxobevo.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/28996834549.pdfIn PDF document text
    • https://medtek.vn/storage/file/82841982664.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/81181623908.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nukitazefu.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zusuge.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dokejipepi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb994264c---88827389120.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/451a0bfa45f8e4125d7b561969e33aa1/dexobakupepo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d4dc359eaa75293132de3a17a23d7645/37717044695.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160af29b7db9d7---17973231861.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9mgmuvs6c7e46j2sj8v74p1rt2/tufexobikewajapigokewevi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/zojakadaworonene.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6fa547faf504c4a35309ccc976baaae6/xupofarevepi.pdfIn PDF document text
    • https://beaszemin.com/files/80558806930.pdfIn PDF document text
    • 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10860 bytes
SHA-256: a3f32527e498d55ab46ced73a31d1bb57794347656aaea7f839f707cacab9408
font_02_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 15016 bytes
SHA-256: ef39f98e32a495de88e056f0ebca5412457e5d6e92bf564365d96a4a5c98732a