Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3244eb8bf7d8be…

MALICIOUS

PDF

85.0 KB Created: 2021-07-27 08:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6b3118f59940e595390d0d7c5ca8e82 SHA-1: 62a19f342ba284df2bacf5f30b26ed89972e5397 SHA-256: dd3244eb8bf7d8be6bb13232fb1ad648f8de788af53c6fa1690b4d9fec0d0691
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b7840c71bb3370fb83db68bbbc96269d/82500999252.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/65280463988.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/4254137091.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d94930a6---safolofajefamuj.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/23956670351.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/81972816491.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/tasemopus.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a431464e91d---nufokilajejadenoba.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/busejizesima.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0304fd53---17520814883.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/84743776344.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1t5hm8vjq5doar3gdcs75nhdnf/mupedipiwarubizevatipe.pdfIn PDF document text
    • https://birudongker.com/contents//files/zekasanowojesidimajazis.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/45966608237.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210626_6B9858FBEC5A1912.pdfIn PDF document text
    • http://vuason.vn/upload/files/92527328296.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/18454229383.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da1111103f7---74207471984.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/96367006973.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/15fc7b8dccd4aec38a5aaa8ce92efc4b/95390181147.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/gukuganuzetukulegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+comparativos+y+superlativos+en+ingl%C3%A9s+con+soluciones+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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 18088 bytes
SHA-256: 410cf58dd6baf546aa2ae3d1ab5043e329653205a48529a4d0f7d386f2b33ff6
font_01_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 11508 bytes
SHA-256: c39a9d22708c8c1203c7bb9d4a95b2e4255758f9f6acfeb5a10547b018e65151
font_02_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1