Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc172826b34c9d4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 17:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a913899c7d8f88456880eadf2eee671 SHA-1: 556d25795ff9aa9da0d3daef85d7f8be307b8a5e SHA-256: dbc172826b34c9d47a673c6a8d94543b4663bea9c18a4d1f4583b89e79464dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The presence of a link farm on disposable hosting further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2c5d844fac4a353d55499530d87df6ac/pejipoz.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc74be62---56374105400.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vobuwiwebojazumubo.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/85239148856.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/16718725999.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608443e83cd6b---xevoji.pdfIn PDF document text
    • http://hevolta.com/upload/file/85031280918.pdfIn PDF document text
    • http://nsck-cykelmotion.dk/userfiles/file/53154564072.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210707150713.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/roruloveda.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/32201270241.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02b34d717---fazupuwexusiwijo.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wamewaxiwixawili.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad09f9629c---segor.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef882f1518---65479039488.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a633e03c338a64ab289fa474ed1d1477/goniwobunirafow.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/xarijebobavezokirunemida.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/gibapibozixu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22770c997---58706041991.pdfIn PDF document text
    • https://mollis.rs/files/3209785525.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9a622f85---sibagovoxum.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f422934955---58649344585.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/88009390003.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/76229914572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cellular+respiration+worksheets+with+answersPDF 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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 10656 bytes
SHA-256: 95022460bf4ac36841dd31d738fcecf42a79c9f1e5c193caa27113e5aaaccd37
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 15756 bytes
SHA-256: 842788bcc2372fa324f5bbfc1fa0d896961634021bf7b1fb8d8965451c938821
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1