Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8ccd1a57764981…

MALICIOUS

PDF

80.1 KB Created: 2021-06-27 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84be6beb34bb53db486a5f9fa414d6fc SHA-1: 5c170b698f2c41303dfd202f3172d7d20fa2c023 SHA-256: 8a8ccd1a57764981744dbe019cf64f1b116a4c016b70b35b5fbca831314e7b22
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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 https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29f4e8a1f---86030929364.pdf
    • http://winkeleninzundert.nl/uploadimages/files/luluwobikamatupuro.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/13d1a0d753dcb7b0ede3f2c670aaceb8/16750299426.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd62726a8---40897893280.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ce6d2f188143232940b72c4e4247bbbd/14969690857.pdf
    • https://noddy.nu/images/file/rewafukekuvux.pdf
    • http://ctkupavna.ru/upload/file/77422304451.pdf
    • http://agcslohian.com/userfiles/file/buminevav.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48b842cd0---67002584043.pdf
    • http://bora.su/ckfinder/userfiles/files/32859426841.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97af92ebbb---7650304505.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3859e908---maleve.pdf
    • http://laiyi-art.com/userfiles/file/jejurotezoludigi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d6b49c9b---12643969901.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fb2cdbb192a17bb990b52943a9f4b992/80376919123.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7threjh4g6lg7hr5cb25ife5o3/37067503926.pdf
    • https://anfauglir.com/images/file/sijiwu.pdf
    • http://titadoorbinhduong.com/upload/files/nezatagofusavidixa.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mc7j2t97b8u8pssf3e3netjqe0/43550755644.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1ef0ad2abcc557cb500482a8fb792e3a/25264315148.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/28407089873.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58358078310.pdf
    • https://aspirans.com/files/file/zoser.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda1cc2165---niwes.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987c5dd01---muvira.pdf
    • https://tenfci.org/userfiles/file/43789811660.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=porter+valley+country+club
    • 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_off0000d4f1.bin
a94312923bef9177e664a987dc31614884a7dae27cd56ac8042ab73c54b1d8db
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10384 bytes
font_01_sfnt_off0000eca4.bin
4c91d7475ed1b7e14476a2b574a5a0e7faea6bd254a85e4bc51264b707ccfaa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 17176 bytes
font_02_sfnt_off00011982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 16792 bytes