Malicious PDF — malware analysis report

Static analysis result for SHA-256 a527dc2d7f415869…

MALICIOUS

PDF

91.2 KB Created: 2021-07-27 06:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f4800eb90196e40a2edf33b38db8a81 SHA-1: bf522e5bff3325e9eb0ae438a899b362afeec693 SHA-256: a527dc2d7f415869efbc2b36b5f09cdb65208fc67331412a52ab08dfa8e4cdc4
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d53087a1---gifav.pdf In PDF document text
    • http://kaies.net/upfiles/210714140926449867j6j21n.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e910577a03e2983ea70c2e715c959127/9498899951.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/35406995971.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1dbadcdb1---venamemawe.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd94aaa66f---wimexijinijiroxanuferame.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/82919029990.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30d03dd67---wubigeworejewene.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7d0a0ee9---91254493650.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/42850011368.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16088604545998---titujuxez.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/93724673805.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/kaguwidop.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34cccd219---15634650981.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59225059490.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fdjhu54fpqpntc5b05s9295qab/45415359729.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/073194b2e3e8ade32878e319b29cf663/94906305522.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfb899850---3254923810.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9f96def3---26118079934.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sciau3pdpg7n1kpbtkj9o3rfb5/32437458845.pdfIn PDF document text
    • https://soliangco.com/contents//files/fajovasebipuvorabaweloxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+a+preliminary+report+meaningPDF 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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10804 bytes
SHA-256: 01f08f1869ce0019ea4db2258223dcf87400abb3dd553eb250a615a13cf005f9
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 18428 bytes
SHA-256: d8974a3d4854b005102c24201047fc78936047698bd7a46aed15c2fa35006223
font_02_sfnt_off0001463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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