Malicious PDF — malware analysis report

Static analysis result for SHA-256 3695970690691ddb…

MALICIOUS

PDF

85.1 KB Created: 2021-08-20 06:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eeb4063f3b2062986420306b5bd0408 SHA-1: 53db242f2fb7e58761400693fde7b236bd5da3a4 SHA-256: 3695970690691ddb0124fee3179faae2118fa7223db9865e7be98337265c65e3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or potentially disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://msamerica.net/clients/873634/File/65324544709.pdf
    • http://aybar-gallery.com/userfiles/files/198711650.pdf
    • http://worthingtonpark101.com/userimages/37825419572.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fbbff10b06054c11201650e5b2d5d1a1/juxavosowosutigig.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/gh6jt2quocojmcqhsrcvsvoej6/70289797633.pdf
    • http://say-international.eu/userfiles/file/kivesemokodomebokadipim.pdf
    • http://azizolace.cz/images/file/91799935555.pdf
    • https://baxsporthorses.nl/userfiles/file/funewor.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/29306643392.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e8ecb09f---sutasogibujif.pdf
    • http://dhleisure.com/ckupload/files/wiwedigemifatel.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81887a4766---14715035379.pdf
    • http://gerd-pollak.de/userfiles/file/gewalurewilo.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1987eb34a---40492324339.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/93967354362.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086df77d9c32---daseduxan.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/06f8378110df1010887f3da841fe094a/81504775354.pdf
    • http://industriefotografie.ch/userfiles/files/51795672294.pdf
    • http://mesterek.net/tmp/71288433978.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/kutabawezuwezixapexus.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090beae13809---lipig.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/19646272210.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3457f716379d2024b9c0ae51a0b21633/nukosizod.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b419eb088---wigapoluketuminufa.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160929f2bd4eb1---25231867979.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=concepto+de+economia+autoritaria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1d.bin
b4d303367ba77af30eda30a5d2700b05d464132447338104edb82dcc2f20a517
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16824 bytes
font_01_sfnt_off000115dc.bin
3eca1980663fde187bf69b12764e750b9d101d4b1ec479cbda89f7b43cabeeec
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10592 bytes
font_02_sfnt_off00012dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16792 bytes