Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3abaf8b8e141c7c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 10:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae0eadd77912ee3c8821605ad478b91d SHA-1: 4d474b497e3c53f546e920ed0b3f30984b4105bf SHA-256: e3abaf8b8e141c7c781240afca67671be25d512ee066d66942a1aa1a93709f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it could be used to deliver a second-stage payload, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://arcstema.com/userfiles/files/74589112007.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/fikejowoguxi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6db2446fd7d98f705f781ceedbf64a86/subapisududewozefar.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/75393262102.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zivunile.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/menujenuger.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/xekegoxifubifobunof.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fe505f73e---3597510774.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/65341163845.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/54546082606.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c3cd5c8ec72d571919de62727bdccc1b/xoraxo.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/42279958948.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/rofevefuluxodegom.pdfIn PDF document text
    • https://beltamas.by/content/Files/60538855042.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e2cdcc89---ginufaralijitudewaba.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d254385884---14008801875.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/dizajanijonezigifu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a362a27752---berigasenexivexaragel.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746dc1bfc06---manuvijajodi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635eca3c7---wunewuluzanoxefoxa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/235148432c57d97bbbb164dd1fed8a5a/jezijorogafazuvinezudupow.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/lotalaxonek.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/60762877059.pdfIn PDF document text
    • http://billsky.ee/files/file/giseromob.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160707f4db5e83---dutezizaxejalokanefosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=libro+formacion+civica+y+etica+segundo+grado+pdfPDF 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 17088 bytes
SHA-256: 176ffdc2a0369892a19ec8002a96fb3b5bdcea52c0f6fc0d589b3c580fdea0f4
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 11292 bytes
SHA-256: fc5b5073012b749c39b460292a46b109205e50906cbb8a61f248b7efa9a5499c
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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