Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3adc95a38e482e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 00:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ab5a849d51f1bf96f2d9a82f5536638 SHA-1: b1436186c0c941f4369901c3fb3c9aa2cc84b20d SHA-256: 7f3adc95a38e482efa3528f653697f6060e406e4eeb4c9111ff9613ed4cba8b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and compromised CMS upload links further supports this, suggesting the document is a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=how+to+record+a+conference+call+on+android PDF link annotation
    • http://www.miyadenthai.com/image/upload/File/vuvuzuwafolidope.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/96388890905.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/zewadeke.pdfIn PDF document text
    • http://zenkatsu.dk/files/67475887913.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40390361172.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/16417910498.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec837ddfb---webanumiselapazorumujini.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/44598017189.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/56365857766.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/patupafevejabitelekezalef.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/29025150175.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/xavewejuturilanififumamap.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/82927680998.pdfIn PDF document text
    • http://keyseries.us/userfiles/file/teparopuroserixowobofiz.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/56502335140.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/sufulusabeveroga.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/52230745846.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/gidixebuwek.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/rezukixugizawumik.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144ae50d9447---rinupi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l3pr6u60ckeue15f7mkb05vuc7/jofuroj.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gazuralaben.pdfIn PDF document text
    • 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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17224 bytes
SHA-256: 0badabcda29283c0ff1691839e27930164b5355561f0a056a1a06f0222177574
font_01_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 10376 bytes
SHA-256: 7ed58c13b17fe8837d7ff2023a9c660eac5606b4a8d7dc41fa927ebfc0790fd6