Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a93caf6b155dba…

MALICIOUS

PDF

94.5 KB Created: 2021-08-01 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 999bca0ae533e97c9328adda0f6e8b6b SHA-1: 7733fa06f2b366deb235bbfe4c56a5557aad5462 SHA-256: b8a93caf6b155dbac923d2308863620a09f2c434b72436ba6df017dcdb469b10
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple compromised CMS upload links is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6dadd5b5---87605740885.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gusifmqimla0n4jibo4dn7p2l6/28266288000.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/koxelapivo.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/tetalajiwemepaf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c196d63cf23bc3c816401b8bcdd57be7/58768124294.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/45167336795.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/1834445693.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/17796649346.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccba3a3dd22---bulefasepazaxil.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0ae48a006250c6c70e7d53e0c0fa07f6/93784191075.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/vaxajugamuximos.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53486222116.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c745b378b---lidofokodilebebume.pdfIn PDF document text
    • https://cafesca.com/ckfinder/userfiles/files/23572011722.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/d6916c6c28457a31011e01007d335f58/27038504794.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/wiruludalapewofunamilas.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce0991cf0e---48106232416.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c73324185dc42ae77bd194ba1933a262/monodikovogaweromijubo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/91202732470.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/zebinofifexewixufez.pdfIn PDF document text
    • http://mylodge-naoshima.com/21155881261.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707efbac398---vowifoxovosidasaxogapegi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097516596b7d---47281390328.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/68dd9cef39e7b49ebbef4a43da06f3b7/56251388392.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/61d514005498b593715da1881df79b95/wetagoketulute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zomm+wireless+leash+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_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 10424 bytes
SHA-256: b7db61655e527bc20a996a3eb8c865909d53218acbad9a2391abee2c7b6128fc
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 17584 bytes
SHA-256: 6a8bbecadf4b8251f629cbfffd1f755822fc4ecba50f9c0c0fa9be8d7fa9e889
font_02_sfnt_off000151bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1