Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709590fdafdaf8a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 02:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c65256b78ae9ad6f528049374cf63ec SHA-1: 399857ca45d80185424a0086de0af4aa3d103141 SHA-256: 2709590fdafdaf8a2f3d3138ba64a42448a86f4282487c1ad50b36fa2c98f7ef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://planet-for-events.de/userfiles/file/26012558812.pdf In PDF document text
    • https://mmoxx.mn/userfiles/files/maluton.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/88785266622.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/luxerifafa.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac040a686c1---31713716932.pdfIn PDF document text
    • http://huntland.hu/upload/file/20351194525.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/notavopewaxojeval.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hcq7ek398nngapvnur3jvhudq6/59067935799.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fq8uuom3tkri8fo0rntg4cl0u1/tafekoderobexafozatovu.pdfIn PDF document text
    • http://web68s.com/upload/files/65660793681.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b279da2747b---pilupujedefepif.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/92824916017.pdfIn PDF document text
    • https://arerp.kr/data/file///34566940653.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789d6228cf2---21914826176.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/21448755287.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/tugoxeduduripomobewewo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1a4404ba---dakewabefuvogadakudupaju.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/48a357609c08513ec0bfcd60f2dfa9ac/jeladukejufiresekugum.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb19344ee8---50754271038.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/fevepapafexa.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/90848362481f09eafcfaa3d80e4b5ac4/17289441275.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/tiwijowuropuneki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=functionalist+theory+of+deviance+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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16864 bytes
SHA-256: 482a3dc225e423b423e7d7ca872ac57030e6f8305dffaf0e465687ce8074022a
font_02_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 10976 bytes
SHA-256: 2aa4582554f30bc835ff58294649b7b20ed18850a11681b790c5ddaad951d516

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