Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ede5ec5bd7c78e5…

MALICIOUS

PDF

95.4 KB Created: 2021-07-04 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4d08e855eb770116462018ad0d40e7a SHA-1: 76deddcfe24c51b97fb614aa6a496dd14563e9cf SHA-256: 5ede5ec5bd7c78e511fadfb0958810b88edd9bb1c0535875df9b8ca72ec273e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or downloads. The presence of multiple links on compromised CMS upload storage suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://pkynfe.net/userfiles/file/28828515957.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a152ed82da---51830827122.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/09d0d12f272d58d71093d72392c67228/sefoxagesotasaki.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/36335493152.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f914853657---regajuzoganafas.pdfIn PDF document text
    • https://eternalbliss.net/file/denika.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/nomejoxutujev.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/20268875847.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440051374b---82369920079.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75685983465.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddf867974---jelasubogo.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/wimorapoxaw.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/94780643418.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cca475b9d---xufefivunufexorafejedib.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0886d07ca4---77178981000.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8bb50ce4---21588031461.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49d7eafb31---18603262246.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510065520998996.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/67051530994.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/47216918427.pdfIn PDF document text
    • https://chp-travel.ir/data/file/kudututogawu.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/menufusozunoviwe.pdfIn PDF document text
    • https://mszukam.pl/dat//file/62011061969.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/zupip.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xijugaw.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tukimumisoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=linear+vector+space+in+mathematical+physicsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 16140 bytes
SHA-256: a1a119a537d0832ca63963c8fdd84b71b1b15a93d2dbbad7416bba59116e8d01
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 10776 bytes
SHA-256: 6afd5a5e89408b841abfa978deff8fe6dbd2e51f7342f5a5ac8f30e56f696337
font_03_sfnt_off00013ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 17876 bytes
SHA-256: d09c2ba07bf2d8b669df7c2fa7e0f1b590ade4b7e4ba862036dbdfab295f6892

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