Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9aa08ae87f190f…

MALICIOUS

PDF

76.9 KB Created: 2021-07-03 15:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fffb91013c12a3836d0d3c2f995233a4 SHA-1: d9279996a65732ea93fcb6f0aa577d85dc2bf3ba SHA-256: dd9aa08ae87f190f54ac3b91d7d4dabebffad0a2adf6c87ae3b18192f0be1d76
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://suapaiatuipelehakefamily.com/clients/80707/File/49306596990.pdf In PDF document text
    • http://mextro.de/upload/files/65470802249.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/63170ddd018facdf8895be3981824230/75483364920.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xevoseletuzoduwi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dc2vapulrg4gdnss6l5adqirj4/tumupi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5205d387d---7213764856.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/neferuwasi.pdfIn PDF document text
    • http://lukinserv.hu/file/tupapa.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/1611245455.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/30585183401.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2377edfb2a---66567858872.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/suwavazitejonuk.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d068df881cb---94570859858.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/39a7a384669873a1a2b360873ac82323/93341234532.pdfIn PDF document text
    • https://termofriz.rs//files/20326286850.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i5718g88llh7lj6c7egqq3ke71/xutameba.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0cfa685e4001054ea8bef9bdce2f1940/gifomomo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/8744397512.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/073d6b1319da35060f08e70ef7edde41/gorugufujavagujajo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5lca419p6oa8cccp5769aofkj1/jinusalebodemuneladuzo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/61493443244.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/898170961927a0fc937ff4b2622f9501/mipapesuxixumuzizu.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bf1b785e---xopuluwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=trout+and+salmonPDF 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_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 10248 bytes
SHA-256: cc3b877df9a26c4a1734c0824cababe970da2615f5e676f41d571b8376434ae3
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 16388 bytes
SHA-256: 4ab23861b403275ebca72c77facf26cbe120af5d5ff400f33df246525c8891c1
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1