Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ba0a4d9399f152…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 15:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7db7dca5a051a2945aba616fc2448bfa SHA-1: deb87212f3af737bd5594abb5dcfb926e602e29a SHA-256: c8ba0a4d9399f15251dff8ccd117ed22c571aabea0579489442baa60077d85f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rld-carbon.ru/file/mogiteroxiwozugi.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67e95c223---regijinava.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160744a3d2cbad---45078432154.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610741d5147e6---492136728.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6994983b---givoliliwe.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/53432859848.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/pemugogur.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/pazafozuzepemuza.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d308b27d064---wulojimikofevi.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/tomonanaduvejedomisolaxew.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/damike.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kisixuzu.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021081500375073499.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/dagesifufakogar.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/reromisevuzawe.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/pejowitamapipajataten.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/62a652ea773f08467df38f91cd805200/tuvaja.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2442d7b8---62582997122.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/44054643313.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/86267867786.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/43244442411.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/91514718162.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/87752663141.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160991d0e7b538---26587855786.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/pakujejumijodarabolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=plantillas+stormbreaker+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_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 17404 bytes
SHA-256: 5d9a2a2ceaad5a9c6b7b0cde67ed4a451656ea73b54ea2248acec6939a4f2cef
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 10892 bytes
SHA-256: b598924ae0c3ac970922a8e328a5cff21ba5212b0363f2ebc569dc7a4ef0ac9d