Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bdde0369da8cf5…

MALICIOUS

PDF

89.9 KB Created: 2021-07-04 11:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b5ac785ad2127db1932005a955d5297 SHA-1: 61992a187315b1748a5ef286e41ef092d275b8b7 SHA-256: c0bdde0369da8cf5e52ef76896962a5b7b9cdf59b1340945756c1d7eac320225
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/23449146822.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rpb9iu8gc11um6usobpg1emhv6/doxozuxewofuvogavidaloto.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ff10vhr6jfd5if693920qjo8s4/81925904732.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/pifukupiti.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/23389693032.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/92215354055.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b466828721042ea028d6cf0607bb4f/48036167553.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/49924995920.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/16472077353.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b8fca43e---26154196245.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9dfd8e0f4f8ac6bc6038a1efd8fcfa51/30200244482.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wamuwodiliwor.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/008aaa47f7f76be5c1dd1634cce93044/17784343158.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f8e28980b72181fd53d32e183acc93ed/48821054857.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/libabomokafurejamate.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d7efc9e---sepafadosam.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/mokumuz.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/45985445638.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/62943313451.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13359253a4---mezukapelitovef.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/56ee1d3935b43bd25d00128f2975a533/17952287578.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10a484d7afb4d656e7e26d01cf789e20/gikatuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=home+alone+full+movie+part+1+downloadPDF 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_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 17444 bytes
SHA-256: cc205148d143f1cbc57c76297a3fd5c09acf0de4bbc99688a693e22d1a0fc708
font_01_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 10784 bytes
SHA-256: b6bc406383e8ec8f26d7c29509246ef5d7dd5bded0d012409ccb1bbd15923345
font_02_sfnt_off0001424d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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