Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ab2fb1bdc89269…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 17:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 962566da87bfb17b6f56de72937e6875 SHA-1: 99a7c2e33ba517b4b5e9835e9cbb7dfc9612dcf4 SHA-256: 80ab2fb1bdc892695a0e2aaa2b33548389d7ded13e41b81358a0cddaf566b225
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to files hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing campaign leveraging link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nordicwalkingturak.hu/_user/file/wuwafutepitefuj.pdf In PDF document text
    • http://csc021.com/userfiles/file/20210906150900_fe032f.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74432756652.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fosaxolekuwemigepebixeno.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/tokosipebojitife.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/sadisidukugobitupodabibep.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tijopox.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/25394110892.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210906135625.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210901210154.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/32943187803.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/xujararezijujonarudipe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd1fa6de6---9349959766.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/71154227229.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/84037311860.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/87382677762.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/64484007164.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/29963719836.pdfIn PDF document text
    • https://inarsindbari.org/uploads/66171443068.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e61e6a045---56669261035.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895ab49a3---jokudiladotaxisojase.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/81467859960.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/dizeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+10+bloggers+in+worldPDF 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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 18496 bytes
SHA-256: 4274838d5559f69caf53c9cf40f642ca069b96f8e904c2c34248b73a969f375d
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 10668 bytes
SHA-256: f9807b36f5cf0000214ca18a76920fc3906e11b694a36a33a419d5b251f87a84

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