Malicious PDF — malware analysis report

Static analysis result for SHA-256 3289bcd683d1ec67…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 18:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 996b27abb2440500214e1e9d4061f1d5 SHA-1: 32adcbcf3e2bb26f37ee56dcec94f87abe387b28 SHA-256: 3289bcd683d1ec67a98be9ddeb7654d2e9c236b98f4a01c2ac4d49eb2f1ce0db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous links to external files, many of which are hosted on compromised WordPress sites. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate that these links are designed to lead users to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd4e389cf6---54081120192.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d765179b68---88582485531.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kawebipodipilatigenalav.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/67845908842.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a9837224---91998626567.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/81752642e0bebd1ada761147bd096a26/fidoveb.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/63j491s8qhoskqaq08pri0s4p3/nepagixujawek.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610deca79264f---96705311242.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/gonidofusijiwaf.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vikud.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/kewubaka.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/suwadakimufezikaxiguxiga.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/12758802124.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216cba7fefc---89970344220.pdfIn PDF document text
    • https://birudongker.com/contents//files/fajuboxopod.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/69231117966.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c135c905a91---poroli.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/47539066993.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/16358164004.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/78b0e9693e43a392a1fdf98b29723986/mosarasemopofiz.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c0a2c4b21f06919dba47f4dbbd6f38f7/fopirugozabazujil.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4a4bf27a---90582737207.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601325a567---lebuguwitevaj.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15179905545.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8f2b4cbc7d9622886731b69d315cd10f/pobulerubugudofelud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nuance+pdf+viewer+plus+se+applicationPDF 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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 19300 bytes
SHA-256: cc2609a5e8d80b888637d0f3d91764445da4488a39c12175ff20ed80a7c168c7
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 10840 bytes
SHA-256: 179219b74c75f28afb8c656d5fceea31c199136e167db4b7feeb90b2422627cc

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