Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcb1e3d9526c1d3…

MALICIOUS

PDF

91.4 KB Created: 2021-07-23 02:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6aed804db5d0f7c15c77d9f9ad03f568 SHA-1: c207db3293ee043ba335dbd7b85b215aa1be81f1 SHA-256: ddcb1e3d9526c1d3f6417f761c19b21e6e8757488e2065720c9ef2b12483f316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF link farm heuristics and the overall malicious verdict indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chaplains-camps.org/upload_picture/file/74942387677.pdf In PDF document text
    • https://iamtimeshare.com/userfiles/file/15811862630.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfe48b276---78590751923.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160948e0a68f0d---3448790042.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa02476174---galijubowewemuxonebuji.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11f776e58---letobegelajafar.pdfIn PDF document text
    • https://combrooncom.com/contents//files/65805769662.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e766d7e7f1---zotofunepuvetivi.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/jibutaludadekomefon.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/sanukujumolodovol.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nebefo.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/pefidupoloxajedupem.pdfIn PDF document text
    • http://aven.su/userfiles/file/liwukilesowareguduvulir.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/443edd9d74b2d65df95e1b14bdeabab2/6050806849.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/fakaraburijomakeg.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/iv9qvogv0lvmpdo62pluem96a5/20681764339.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/jifud.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/93940139064.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d1107709a191fb3b09cec11c2448ecf1/gelul.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/497d82356513ca48e031cc8feadcf789/fofofademunev.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/37115227804.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0e516c209a47c1a7ade666610cf85ec5/14650468244.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff4e0ac7d---80015123657.pdfIn PDF document text
    • https://banghenails.com/upload/file/30263727446.pdfIn PDF document text
    • http://laduses.nl/image/file/jizikovomogix.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506062227343119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=application+of+gis+in+civil+engineering+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_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 16364 bytes
SHA-256: 10c1e41fb6a84e72b9766e46e1d5aa3a893decdf44ea7872023308c04233fbb0
font_02_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 10844 bytes
SHA-256: 451ebbc8358d3c044219c7b7b441bc67c5d60f09ab33c8c7ae7d996159cde19b

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