Malicious PDF — malware analysis report

Static analysis result for SHA-256 5612149b81da060a…

MALICIOUS

PDF

161.4 KB Created: 2021-07-23 15:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9941725434474c550e7ad56a931d00c3 SHA-1: a513c8dd7ec2d1848a01d613612a469a899d8795 SHA-256: 5612149b81da060a825a2d903d4cbdd5e330a6d585de04b4a427ec9daf9909ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that redirect to various websites, some hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to leverage SEO for traffic generation, likely to lure unsuspecting users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4594a5d43e---11797890646.pdf In PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/734e22f8a89f456c7ec89555d0a5a862/39025999279.pdfIn PDF document text
    • https://master-service.ro/images/file/gefuvolova.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/ruxizojoxobetivosivi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/892cdb7662afa86732e30a3e7f677956/62202199411.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/lufododojopopidobuz.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pibof.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070314483458.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0685ebc18---39545687738.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pi160bjj3opeq5c7n3310rlemg/bumotuletikosovesezikava.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/eb3nl5men34qnhdr881vfectbg/99944509988.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cbe343e2---33829281721.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g15gutosbcbfhrinjknp4rfia0/73808377795.pdfIn PDF document text
    • http://alcantara.cz/data/file/kamuwefet.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/wexoxojefajuvokote.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/5662740000.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e08ba9e21---36392336497.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1db8510242---86229698863.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/23317582151.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/5356968827.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e0cc27f6f---88053059307.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/69321652946.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/68886135863.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ms66ta8lgmmsdiehdcghf1b4u1/sulevawubazidokowadibezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ccna+cyber+ops+dumps+pdfPDF 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_off00021a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A18 10928 bytes
SHA-256: ae779f30374fb6da57198ca3f567999128e0f6698db92ade6b6d24dc6f4fcaf8
font_01_sfnt_off0002333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2333B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B4D 16864 bytes
SHA-256: e5dba6b1a15c99523af34cfef938b6f5596641a32166306c6dcf6b96c452f9c4

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