Malicious PDF — malware analysis report

Static analysis result for SHA-256 db23d2dd188af669…

MALICIOUS

PDF

87.5 KB Created: 2021-08-01 16:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2f9c6cdc78322683f45f114352d32fbb SHA-1: 6df02a23bc1c796a7fa5ca428c3b57e13143338e SHA-256: db23d2dd188af6690574038fd0f763acab39bb8878996937eb40db8e046745dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

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 https://energooptima.hu/upload/File/76443965806.pdf In PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/f1a3383039bc2d813fc3e773e3104e94/xebevoribizasinem.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/ruvalefosamizame.pdfIn PDF document text
    • http://vo23.ru/upload/file/31184026424.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc869f960---15606235427.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3b2e9c11abf438543511494d5804410a/nomeda.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9c2437ae3f399748ef9d2ec581b1d979/tisajetafox.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/62751997064.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/f4bi6qpsn6g24vq5oag1hjm6jt/8621919070.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/58714078566.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a771024301f1bc79a15b6a8923da6130/berana.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9572d8fe7---gijugubavusud.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bogagus.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/85859514726.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/68236606064.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/75174842557.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/99572877287.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/wawopojibozizasiw.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/rakodimiwunek.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168009390d---rajipomifojem.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d716275bc---memoxinuboginopatulozen.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/ligikisejakapibori.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/60319772039.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589840648f---54522346176.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/nasosawuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+choose+medela+flange+sizePDF 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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10960 bytes
SHA-256: 7c25ba533f39191470bdb11a9663b08c1ce394a34bf777248dd9f05c5b7ef4af
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16900 bytes
SHA-256: a0896c79d3ce9ecf28bffb2e8a7fea1eb90e799000be24d37184884a5dd73b00