Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1bd993c10772d3…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 02:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245ab7ae47eb775669e6d5a39842e157 SHA-1: 5b9cc31f18b3b6c6f8181fa4672b26d5792c093e SHA-256: 1d1bd993c10772d323bfdc3aecf62df0436ee19d3bf80588d68751fccf14efb5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure and numerous external links suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dui-antidote.net/images/userfiles/file/genivawotibinifosizokoxap.pdf
    • http://mgocsm.in/userfiles/file/52129144939.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096548503858---vegojoregumufiwe.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4fff0ae92868ecafc8baa30b04e1e785/81363741442.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607289b850bb2---loximaxeb.pdf
    • http://aelma.com/sites/default/userfiles/file/nerupajob.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd10552d21---81743973488.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160964b524f6e2---debijewigabinux.pdf
    • http://soldearenales.com/galeria/files/90459317699.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b79084637---miparidek.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/m3l6bv7b59fmr8j0u7l2n7n4p1/logem.pdf
    • http://cbwmd.com/uploads/Files/74953357702.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607af625d865b---kuzufesawufapazuzarer.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ibkbgb2l8pkt2hb2gdodkdeb58/84055928189.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/42713023936.pdf
    • http://mai-colle.jp/userfiles/file/37457637255.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0e4a35e48fb9e19fe7f63575c8f5685c/napuxarowiroti.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/25d552ce8e4347683725ade207ef4689/58689994521.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9c06ed1920655ecf23b5961ba15d25e3/pazebavugokifibifijogozom.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6efa3f8d---sibawimagezipol.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/av1dee9p8sdgmiqi76oj7i53n6/dezuximixowolug.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad8fc46900---kukutewogadasakusuluva.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607a925edf4da---bekar.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3d4c0d61---lafakuzojemupu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=extrasystole+ventriculaire+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin
8a3caebd0bc40dce706c671e0c485475bdf17681bed9b79e15b4c2f9b79c8107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 18940 bytes
font_01_sfnt_off00011d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
font_02_sfnt_off00013535.bin
0590205299545c244a3c205942fe24f9555aa718a8622a874fb8422148bfeed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 10980 bytes

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