Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed4fe8f1dc4330b…

MALICIOUS

PDF

84.6 KB Created: 2021-08-23 17:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b59f65bcd6f645ac298887586de18c6 SHA-1: 941205842d4ad064ae530d73f3dec9b13acb8058 SHA-256: bed4fe8f1dc4330b3fe2d82bb6674fac1b40c36cb1c0d3e4c0fea8dd3f44ee71
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious content. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://liveranigioielli.it/userfiles/files/tuxopobubijerewepevige.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/va26kfr3kv1au53439l513hd2o/38157253483.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8a162c5926f200d5aaac357bfc3acd82/26669666850.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/xelafobobasovidanilukiga.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc6b9053b---pilorevusapapupamusezugu.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e093b8ff9f---90766442011.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ff9fbfa33---daporewurodufomenezanaj.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zogewanizikaxanegive.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/1f784a097ec2c56aee51710ef4e4479a/direlasipadawulonuzupugaj.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/debudafenatifosiw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/99c5347cea1f6d9aec41169775e8deef/22295807368.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbb27ea68---33900843550.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2530548ecf216612a7eecca406f41a15/89871630403.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/solududo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/28884112880.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/78365308903.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/51300afe8881cf4492c3f0d6b94921e2/54255740410.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ccbdgrpumfqnl6eu77u54gjp41/jevurakukiretane.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/af2cf67322310bc273fa83db28f10322/pabopepadusitunewo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/bejudala.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/45768217174.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/zogarifefubawakonu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/16583650897.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/88302739423.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4cpfpjtepjan894hhjukrbk3ul/6602151143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ethical+conscience+definitionPDF 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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16984 bytes
SHA-256: 90c3cb76614bf5aa36196764d40e7c7323fc8870176ab7bc9da23f178e1ce470
font_02_sfnt_off00012d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 10456 bytes
SHA-256: 668e0b5ee6e6f2f8a0c763eb55f2d315ac9fa8347eff06bfce98b8c7b4b2426a

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