Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa4e3e2c68dab8f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-19 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: efcaf1d3ea923f0931b300d5cf513f5e SHA-1: 5c5e0fece32a827f39304294403ef8d56343622e SHA-256: 2aa4e3e2c68dab8fabfae4b72781a3ce59c30ac836699cfdee1bf998aac894dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristic firings point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/270432d1ea2ca4588af8c8346470b157/46617573858.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68376216fd8362a4606bef9c9747cc59/libonurifap.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/imomn0n57rbfk8lnu48ie9tcip/xelapuj.pdfIn PDF document text
    • http://gewald.ru/content/Files/90581533360.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xiwow.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/97763763330.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/jijotago.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/bojizuwadalaritetatemado.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092c00c1df4a---wasaxiwuduxigo.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/50033468584.pdfIn PDF document text
    • https://ksuskalology.com/images/file/98260976331.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768708e4734---xaxifibabak.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/buribikafuzizefozekaki.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/79479035306.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbede5777ffc6827c0b0692e9af8473a/34968602851.pdfIn PDF document text
    • http://moneymaker-gold.de/files/61764701441.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/96320180310.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/30475201689.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/aad4939f0dfe0df0fbd734867c708403/14279588319.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc48f86b3e---pikenakisejudip.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/21720676678.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/forodefiravibikujiwad.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/vives.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/ferefepalifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=attendance+memo+samplePDF 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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 16916 bytes
SHA-256: 04ae8e9cacea9c35976e82d113cbcd9923fe0547428c8d547bdbe58db24ba09e
font_02_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 10464 bytes
SHA-256: ad6b2c353bae5aee8969f731b91554d5d24fbf7173207bcc3be4f15a514a0f4f

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