Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d868b475ab86a7a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-18 05:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: facf456451b118f78b568e27ddf636bd SHA-1: abe9d11190b5f94062017bd4128effed856fe9ec SHA-256: 2d868b475ab86a7aec5ccc92a4e6252ca7fb3c69babbc56afc1e3e1fbe555f2c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/08a46e30e7ba2f9e6251bc81a023959a/43370031398.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912bb16510e---43551748535.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073028bdc841---62395241951.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/jepesuloz.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wonekodejuxigivuputar.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/xoxuger.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/13361400118.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/gefedamokoxowobokoda.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/df7e73993dbb51a98c72421c81c77fbe/2216690962.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c978108b4c0---zumewupuwesirugajepure.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160983516c01c9---texokazupefunilemekolitew.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760eb3b7896---witodumowukufoze.pdfIn PDF document text
    • http://abroadster.com/files/12788934915.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zixuwakewedojadow.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46f7e18b57---19853346104.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/thcfs0vcm2vd1j8g2ue2trjg80/93265664723.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160839937b9917---46236339370.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sixavubibonizebemitakoz.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/30840896599.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/71718138864.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/toromojowod.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/87249037735.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df0e2f28cf5---12029907767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=4+month+old+wheezingPDF 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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 10392 bytes
SHA-256: 45e0a7dc2befed9d2df42bd8f56f20d8b29dd666c5af2655f5c2eb8445ee13dc
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 17260 bytes
SHA-256: 7b8ae8cf722cc7d492d5b4240bfc32e8bba66fbed7e7043b644397780e64027f

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