Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67531436257c47…

MALICIOUS

PDF

81.9 KB Created: 2021-08-09 15:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 069ddbd29172b21d75fcc24699b62d04 SHA-1: a69aea057f11647aaefe899a18963214bf18beb2 SHA-256: 5a67531436257c478d65d51e04e261771509fef9638941399a66b45630926c4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/famelonevijije.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9f9cdcf9---28551040255.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607284fe0c936---88171740643.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7930aa02---topevovoj.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160afaacb9592f---74144237217.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/wufefelomifivo.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69820346178.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/55119411271.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ad4382e5---rizukokogisogok.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc51a42f7---sabigewolanuvizo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092b209dea65---57551878166.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/busabamuzuxafexovene.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/sofalozejakik.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/33195740474.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/16340670361.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17227d04a---xisazelokopit.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/18639818819.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/fibipifepulotazowidoxel.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/22174356242.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/56f730bc333d837e411b4db1a46f2c59/53216717865.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/bbca50a0aa58e08ecb4dbf6b42d863ac/34924081818.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/1247a304b49a4230d859301dea3b3176/96938385671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=iso+9004+version+2018+pdf+espa%C3%B1olPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 11364 bytes
SHA-256: 8ad22d9f8869753e32bb9bb7dd4bbc1bb2853b9234aecc24037e10a3d34e43f9
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 17364 bytes
SHA-256: ba019ede18c266c8b905c62aac71db333acc8a2e5506865894df4fce0ec00c8e
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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