Malicious PDF — malware analysis report

Static analysis result for SHA-256 17530d6108911340…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 01:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94103d140abf7e5522ae77a5c6d360c7 SHA-1: beb2e81dc01b85913797af520a6baa1fcc2d0893 SHA-256: 17530d6108911340a7ef2f15a1d11ef74943a66591a39f24054b7d62b8d0f08a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of these links suggests an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/o1vg7qo1r6e9ou9e88necf4em7/nezelawoxuvo.pdf In PDF document text
    • http://bukhatirhomes.com/userfiles/file/3350083028.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/84604233186.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f665db89d2---nebir.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2965d3c961---71931431219.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gader.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba246d04ebd---19750196953.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8c23bdd627c7dfdd4fcf5fbf42c663b1/marugurobirukivalif.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d3cd0aef---41517542924.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/pogaxuvifiduw.pdfIn PDF document text
    • http://camwater.org/media/files/50707899777.pdfIn PDF document text
    • https://btegypt.com/file/68636819753.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/nujasojaxutazodisaj.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/jepeponasikowikuvama.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/mukilakepezubigip.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lalar.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fde699cbb84---sogidulaguletugafezalunun.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202183163330453.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gavum.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/sofutenufin.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/laxifisubunerogetiletode.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/wadugutixiwejiroxixotaka.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/53674189296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=omron+body+fat+scale+manualPDF 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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 15804 bytes
SHA-256: de74ff579f1977eb88bab003a19c96e04a4aa512c3ce28d8ec9bed0310b7987f
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10924 bytes
SHA-256: e59f757dbd8301080c7a173d16b1ec46698bc94e2c13e8f45a0ee7494e9cf804

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