Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd3f7dd39e8bb43…

MALICIOUS

PDF

83.3 KB Created: 2021-08-27 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ceac80eff7ded1aeed49e35f1c1f574 SHA-1: c34f383921a7fc398d0c802c18a0ea40c7c56954 SHA-256: fdd3f7dd39e8bb430cbf3d591759b48b4abc55aadefd24d5e3acc811212019ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50047c1f4d---74485372632.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/56d2sf554dte0q25q2pvop7co9/razubazikirorafeg.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072750964730---63135240778.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/pupowakizoxinadewofakumud.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/pipizumaliwotoba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e410dce7---17710273197.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ab555a4deb6b18935ebf6fdddb015a9d/fatil.pdfIn PDF document text
    • http://kd-council.com/upfile/files/mafavuditekomasoru.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/52946124273.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/tiletapuzigiwaguvuwoj.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/pabikadorivuruzuvanoru.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/79233650136.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/kesulusuroz.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/6532301593.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866db7975f---desobapegox.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1cda271a---xavivog.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/nolurimo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076229c5c553---9471860580.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/47270226618.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/gokomukesazarexuguzizi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d61acc7d18f---93490434336.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb29d173e---96591405118.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/90197591530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stuttering+is+an+example+of+which+of+the+following+disordersPDF 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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 17140 bytes
SHA-256: 58dd454c567ef0109db52f54e0a5089b3841778c71f2012f61b655812812294a
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 11432 bytes
SHA-256: 1aa30dda2607f9874fab0a1b7739c0f14585392e2162787c688f12f6613f89f6
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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