Malicious PDF — malware analysis report

Static analysis result for SHA-256 580c32f8c7e38207…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 18:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ce043aa92630c161cc61943d41961f3 SHA-1: 04a8315874776c51888c9e4a8e8727f88907bcec SHA-256: 580c32f8c7e38207f1ef6a9d9b0d9637b16b360d64608ed753b2f9b13a0fc897
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms, many pointing to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://clubselectionvoyages.com/images/file/27001217013.pdf In PDF document text
    • https://teamcode.net/upload/files/63912338825.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/96238945393.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/44846469065.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/96489690997.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kevaliferaduridovujevebut.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/13nl9thoet1bpm7u6r81100one/pilavixifoxi.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/24127420772.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916172641918986.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e250898---wevodorazifefepovezo.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/80684832557.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/gifusowupisozulupibim.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860aa8683---tuzegazakevu.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/4186009485.pdfIn PDF document text
    • https://atlantidegattico.it/file/62340658881.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/fotozojada.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/terigesezilusunoxafeto.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/224rai9cgabva8p3q3sk5nqd58/70075103109.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614168895bf18---bapofijopibejupune.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/gisuzutigegabiximepef.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/75612503958.pdfIn PDF document text
    • http://ifap.it/images/file/11414396956.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/jewomusepatovagopedib.pdfIn PDF document text
    • https://olterus.com/contents/files/42764979221.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/38389292992.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c65ed3b69e8f7dd1d868b9ad30e802c8/ravifonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+a+crafting+table+in+minecraft+pePDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 10964 bytes
SHA-256: 80af9cbb9b5ab66fb55360799bdf6a06b22596f7b04e434b9b72f056aca9dc2b
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 17216 bytes
SHA-256: 8fdc67fab753adf285e3bd9c01b35896e0a871d98adac21e3e8a3a3806796022

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