Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590b21fc8bd91d5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8a8d4cef2fd01e131729feb9e013d0b SHA-1: 527545e3a8f18047ac39fd93abf02c3c96fe6faa SHA-256: 5590b21fc8bd91d50f5707c093c92c18e6cd7c2144f2bf725a764cc8b9af4f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm nature imply an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jncs.kr/page_data/file/20210726161523.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d3b7d467---sekupatazufiketudalu.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/30808734457.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/luvotijisa.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/28869104001.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jumowonikaremonemotam.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1513122a46---30231600389.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609405e51bd9c---romuv.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nokuxulumuzopunajonugak.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/nebisawaxevujogebevexite.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/88640816899.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/digijoder.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0pidmkm0g8jff9so675lv65rg2/45858085162.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/471805bda2ac2a0c9c6dbd50bf84839e/88838096491.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vubozevopinem.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0560bac3044e46d7e9b2348f55407c6/nepezamazogojis.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dff592fe7acf05e520bbe8d1eb2a303b/murabokonenovor.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/36354559526.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/30761116906.pdfIn PDF document text
    • https://petek.biz/resimler/files/xapudalisekewigizufinon.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/wuxuze.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/robapamave.pdfIn PDF document text
    • http://someteme.com/archivos/_20210617125403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=impact+of+deforestation+on+the+environment+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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 10856 bytes
SHA-256: ba538b98294245c2c9aff6da88524aa775b17cdca1558d57bd7ec45fc409b21c
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 18312 bytes
SHA-256: ffb7793fa470d7973ca61337b9ab01b7fd2dce628b81a62e6c1b2e1fce20409d

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