Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660f29bb06e013e…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 21:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73acc4c39dedeea425fd5af3095e6485 SHA-1: b6d7798d43ed368960c04c5dc2d1a934c2bdb913 SHA-256: a660f29bb06e013e12ee0d8dbe3e931c6f893e51ea5e164df99b0e5b2907af10
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Static analysis revealed that the PDF acts as a link farm, with numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://incoyun.com/calisma2/files/uploads/63313330209.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802269d4e78---82043974570.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/679b1b1de6121f43174fe588e688f8db/tuxanaju.pdf
    • http://drivingschool-brno.eu/files/44905402826.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pn0bh3vt5ed0p9a8ulb8tgbmf6/zedowakugusal.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb397c8960b---65241417467.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5433a6ccf---69514530575.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ebb34edada27af73c8fed1f6e03b8b36/gavib.pdf
    • http://rolmech-strzelno.pl/Upload/file/sizarilulasuvuwe.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/770a205cd9463a3d80d41737d3052d15/tegaxanogu.pdf
    • http://playeasypiano.com/resources/fck_images/98918561291.pdf
    • https://bandai-k.com/userfiles/file/22204764887.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/61d74d87dcd65edf363821a55a1f7e1d/wizojezimatarizuvogufita.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77e64a5d8---72977510082.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1046ab26e6c63d1f96ae2a6f07c9a06a/5665646481.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/189bb7348947e998fb79b134efab3fe3/xufobenozifixubimilisas.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637e5c97c0---28159473394.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607de938dcf80---54568658257.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca70b688e4---zetijunodawujikasopa.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4af407fb0---4610907081.pdf
    • http://dolphinegypt.net/userfiles/file/92994977467.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=awed+meaning+in+marathi
    • 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_off0000fb97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
font_01_sfnt_off000113a9.bin
e55f6fd22c4bea9eba639a6a6187f515167580c7c8de2f99aa4450a89df3ad96
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 19072 bytes
font_02_sfnt_off00014455.bin
1f90d7f77fc0221bd9dac24ff861ece0dde5d14244e09045be0da582524ed8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 10428 bytes