Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acdb035c4f2646d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 09:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5348652cd86e43cc098b15a4af772112 SHA-1: c62d9a6000624795a9fd3ec9479a0b17eb77793c SHA-256: 1acdb035c4f2646de1369c966c34d3fe0753052e42df01d4894152255f53c9d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or malware payload. No scripts were extracted, but the presence of numerous suspicious URLs points to a download or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sportuna.be/ckfinder/userfiles/files/88816931760.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ceqjs3u0p3jdemhcn17gp1p0g0/92786939517.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/20253400421.pdfIn PDF document text
    • https://gencatakan.com/upload/file/5397469285.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/genikatoxamogizaxorewe.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/47088177246.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1tcb29hom9tsek7f4rfqn4p9lj/zapuvetokogokokaked.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/45894086124.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/62522145702.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/ruzejosodorawifenotoxi.pdfIn PDF document text
    • http://melabo.com/upload/files/67727530602.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/34416981528.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/76431594042.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///60663054127.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/zenuzugikir.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/27110776365.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/siregeputudafowejofi.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/zawevewaxagapavunaw.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/lirir.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/177083955613dc2ab2ec58.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2a59aab4---jibelazib.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tafomad.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/29fb4774f925deb238b948e91f44b43d/kelovamudovoxowexaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=besanko+microeconomics+5th+edition+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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 11116 bytes
SHA-256: c10360b4f122cb087809c956db9f867e7d44aca51cff44297973435e551ce84d
font_02_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 17120 bytes
SHA-256: 0c046b27a00c3e48bed6c78ce2d2cab61b81a0357da6f3e37b59dc607b48b8f7

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