Malicious PDF — malware analysis report

Static analysis result for SHA-256 0067876273c87e60…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 09:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 032935d7fec3b710cd159a0ddb2f5b21 SHA-1: 403fbb78e6d398ab558620fb4ce82de38130c714 SHA-256: 0067876273c87e6030f1bcbfba612a6bf3a25175e12104f9f699e8f9d5431b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=master+pdf+editor+ubuntu+18 PDF link annotation
    • https://mandarinusa.com/userfiles/file/1628074027.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a4f96a9ea859627b8d3136aad5a5914/toporovaxitegijamu.pdfIn PDF document text
    • http://belv.ru/userfiles/file/kifinotumudexoxoget.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/17283512520.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210825135552632.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4e40vvcdg3d237f0ge8dsh0cvr/lalezilob.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5b24344db8a8b8d3632e94f4990eae85/61624132024.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1de69fbda6f78bee7dd7fb13ab2d7eb2/12050049721.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/53047716852.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/208fba34553097ec8fe62ac96527e92e/dujoralilizosen.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d61a8a4c9---19766190306.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0cac6c70052e1551f40490add4e43073/52074310708.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lenuvidefe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105693abab30---bonuroxafozinuliwi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/70387789112.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/82899836646.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/bomozarifufokadi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1c6a5088---bupiden.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/84787466480.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0cd8dd30---95119984672.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca188c781---zipezu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fokesikalexanuf.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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 19280 bytes
SHA-256: 7d0d3d0bc7a6d73680ea4d8a87e609afe33862ff710d39d90c5ab616dc55bad9
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10940 bytes
SHA-256: 3e76264f548d03f6b20dc92a9f3d7a4f5b78cfbde068473603b9ae89e1e5412c
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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