Malicious PDF — malware analysis report

Static analysis result for SHA-256 06539da7fd9e47b5…

MALICIOUS

PDF

134.8 KB Created: 2021-07-22 15:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 27e552856941549f3aa4ad392db487f0 SHA-1: a2860e0a7df67e262dc1c63fbfa46b24b79888e4 SHA-256: 06539da7fd9e47b59ea05a4fc9a4b5129ebf538142bf8f5c586304cc349e265d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc7e85ab0---wuwikewesisovaduki.pdf In PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/87998699599.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/genupuwog.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f2o5faoiaalrie6eupfl94f3k8/gigomotixadumasiguxeda.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/25144399496.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/nimakoradatifomefo.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/vudexopukuj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/72dd3466da4b5ad13983d5a6378b0c49/kobupipedobumubidag.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d82111fe---foton.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/16dc0pqd88dki2hfu39vr8p5i6/63017750205.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a8ab4e93a65d981072acea39333d5193/29022731853.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jm4rslq1hgtefn894bls293u2m/69002313367.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbd99bbb5---vadisazagob.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pavezajuzewabonorevenadow.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3ba0d9bd---59928398633.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/eosso2ch6kn4e2prnbh6gopr4k/75997153598.pdfIn PDF document text
    • http://landpas.pl/upload/file/nuxetela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=simplified+pharmacology+pdf+downloadPDF 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_off0001a663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A663 11076 bytes
SHA-256: f26ae6d3d7aa1619b0bbbe71fd359f56e83d1fad146db47248ada9bce8f30291
font_01_sfnt_off0001bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD0 19196 bytes
SHA-256: 4495081d228c09d8f5f10cc68a40a39d2a9383e2b45484a2019badaf695d61e5
font_02_sfnt_off0001f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1