Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0d356958686b36…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af02833de825697a97679d8b59e8ecdc SHA-1: b99dee21659f3eb1d3248a5d2c7d822956f3bef9 SHA-256: 2c0d356958686b361b90044b3eacc01da43264bfcc1698a85c493c71f0ac12b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest this document is likely a lure for phishing or malware delivery, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/becbc3654a8e82c33219dcf03ce4c482/junanefewona.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/96f75145c2edbace4981e1f1ad2ab9c5/33212960035.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2vm4stfomovd9j285kenqv57tp/soluzisapigofowasur.pdf
    • http://brukbet.com/user_images/file/92043027322.pdf
    • http://ei-windykacja.pl/upload/file/38935477682.pdf
    • http://asid.rw/userfiles/file/zelerevugidupujawuwikuvim.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2150e5fb69---77828057926.pdf
    • https://study4student.com/cache/fck_files/file/11340095407.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c0227bc9---ziwip.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45371d455b4a068d14f7c56ba7243c6f/xalapugawopusezuduru.pdf
    • https://bonekarusa.com/contents//files/vidoli.pdf
    • http://niezapominajkowo.eu/userfiles/file/guvozugebil.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c861e65117---risapuzaberugozadu.pdf
    • http://vidol.nl/userfiles/file/sotexotujesaf.pdf
    • https://majorsagilekvaros.hu/uploads/file/47777404055.pdf
    • http://dmhu.eu/uploads/uplib/file/ruduxanosekis.pdf
    • http://dragonera.cn/admin/userfiles/file/buranavexoxate.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b3c60dfe5601e072d652e14c6ca82beb/20907413635.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4db95f1ce1af98bb4ca98a7e68c8c2bb/68005069612.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98d9911f1---34925584364.pdf
    • http://x04ydivan.ru/userfiles/file/rowavetazajuwuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=intouchables+una+mattina+-+ludovico+einaudi+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA74 16792 bytes
font_01_sfnt_off0000d28b.bin
58af68245f1cbe41b1cccbe6f4cda0b8d06d2b2af771fb92835f0ecf9e263485
pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 11076 bytes
font_02_sfnt_off0000ebf8.bin
f00ac25f3dd0b5f1e0ec576a544756aab0ca5c40ce24004e93b3b68aea468761
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 18012 bytes