Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6fbcda624a617b…

MALICIOUS

PDF

97.0 KB Created: 2021-07-25 22:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e06d33e7356183532bf68522a46224 SHA-1: eadf6ead35d94601e7be8d41a8c8cdcba6e952de SHA-256: ad6fbcda624a617b5611ff61de9555880ca73ff2035a901a9ccb500f1e983961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ristoranteibucanieri.it/userfiles/files/goxexisumir.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/be114ff0a52e1a8dacfea9992589fb64/puvoxe.pdf
    • http://soleilboo.com/images/uploads/files/famelajukezarigupilaki.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972d95635---46108756243.pdf
    • https://primer-spb.ru/files/files/69816149440.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d850c45178---redemozafuzuzoviku.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b0fa545f---jujusutijopuxumimerodolek.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j8aelr4vbbum6pk3kgmlrntmb4/felatekeredunoze.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e7460a91a06c10f0b1030ae4757f42d9/tutagelitudulozo.pdf
    • http://gibeaufamily.com/clients/870383/File/74365284866.pdf
    • https://cowichanmusicfestival.com/userfiles/file/62014270173.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077404045b54---retajava.pdf
    • http://magnachip.cn/userfiles/file/20210514071214.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/34af9536838ee46c4eea5fea4d8e1230/gaxivobomunajutomulufimof.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/08a9068f4432f37a4f478841be96f0c0/potunetosopegibod.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2349e323---99490540317.pdf
    • https://lemanssrl.it/file/lonogojofanijox.pdf
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04713f8f---63919595777.pdf
    • http://krajinar.cz/soubory/files/vokoloxajaded.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091128c0ce4c---9231185083.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161152004---zetusuzasemuwitosebesuniz.pdf
    • http://volamtuyetthe.com/userfiles/file/36581074831.pdf
    • http://wamer.org/userfiles/file/12766830894.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607724ad3895b---95019873258.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=american+truck+simulator+apk+download+for+android+2020
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000156ab.bin
1a651d90c04419fc7d3710b224b71caa3f116f090fdcafd684ae9df4ca6f78c1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156AB 18404 bytes
font_00_sfnt_off0000f4fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
font_01_sfnt_off00010d10.bin
d7c827749a1e506a03f2504a3682ec11647274c7c013c4f6e2199269c26b4eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 17736 bytes
font_02_sfnt_off00013c15.bin
b5771ee8ff4ab69f24cea26bca40e7bb9c610b1ddef7c9cc3a93c8403d3b4991
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 11284 bytes