Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e01e661fe19a1…

MALICIOUS

PDF

103.2 KB Created: 2021-06-16 19:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a4b6b28d2c9d070d63f5bca634f062f SHA-1: 8ac44555057dd5866e8eee5d569a2ebbd2f9a488 SHA-256: ef3e01e661fe19a16fe96e7eacc6e462c9812f3229108b6ce7b506c676960e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://garglob.ru/uplcv?utm_term=word+formation+exercises+intermediate PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/lugasikufilefavatigibonod.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cv0bqku7j55bnl907fgbcn2a1g/raminubonutevi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bcc77a9be4b6eccdd86e8ec0ff2a6cad/71838648086.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2o3p1b48k3r2632aeo6lp8ubhf/877777799.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/zeveno.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a46104fe98736a5de52119690519e50c/xelafo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/56cg5jolrclf7kjjhfj566ftj0/80097885876.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b525nu0kc9le2j3j6n9ki00iqj/kifaguxeki.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fce917ca---71457264786.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ac110f9d0724018e50a0fd3652530efb/fibim.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0e6655a857e40f99a1fb61b23223c374/mononogugepufibaraw.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0babe07a---vekonex.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/48661566906.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788328a8c2b---rumigesasidegifelozara.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/kubezazuvivunatutega.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/25742941825.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/lifobojukivatejofopali.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/95476878173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 3824 bytes
SHA-256: 3dd7aadac262dacbf629717bd7cd081ac66344a0f0d731a5ba04dcb649b56bf6
font_01_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 5216 bytes
SHA-256: b2dcb537c469e0396f059f423445cdcb248b0088b16824b02bc445f1a35a7c10
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 2160 bytes
SHA-256: 894a6c2332fb41ff980dee9e4868a1bfdf9497a392e1e59f71ef4eb7ee7a49ca
font_03_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 17596 bytes
SHA-256: 99be925fd77a84f03e2c5923880a4fd945b9a1cb0d18d1ea49de65b1353a0859
font_04_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 15752 bytes
SHA-256: 6d18086e50f7da0fda6e4ef98a1305ae8b4eddde1531e762e3a919e7b5fa3b08
font_05_sfnt_off00017eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EAC 6084 bytes
SHA-256: 3d88c2136f9650c8b965850d5bd1356ddf71c5fb26fe613ed020ccab7b2cf924

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