Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776dd0a4b1fde06…

MALICIOUS

PDF

140.8 KB Created: 2021-07-01 14:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b181ff7a372d4a438cb49bcccf281964 SHA-1: 9115a1b9c2e28354469899961eecade4e798a1b8 SHA-256: c776dd0a4b1fde06e5913724d1e0501071781fba8dbcf6eaa842d7f6a8d7274a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to potentially compromised WordPress upload directories or raw IP addresses, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, but the presence of embedded URLs and the overall structure align with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/55b71cef10aa750efb5e0e7d99a40f98/79211483640.pdf
    • http://gdwtechnology.com/fckeditor/file/joduzipowur.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t3nusmta0g1iai8kq9oqnkvjc0/65086279473.pdf
    • http://capital96.com/userfiles/file/88029901853.pdf
    • http://kleiberit.ru/files/file/31068724402.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4bed2f4e0---19395207089.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebfcca562---12152198820.pdf
    • http://nousgarage.com/userfiles/file/bosasisobaz.pdf
    • http://akinmedikal.com/uploads/file/30591521480.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d035f85c3eb---54831121518.pdf
    • http://ackerviewguesthouse.com/userfiles/file/bufatigataxirukibatude.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03876b38e4---63883128418.pdf
    • https://juvelyrikoscentras.lt/Files/file/wutazage.pdf
    • https://vibangnhadat.com/uploads/files/silibetavomidedovagabuwa.pdf
    • http://446888.top/userfiles/file/12756893790.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae9b0799c---95625505442.pdf
    • http://ndt-tl.ru/upload/file/gitipaganako.pdf
    • http://cathayred-csr.com/img-cathay/files/43586658706.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b515add5---tesopisalokumapepexeze.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130dda0be8---16191898059.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d37a168f8---dalujumutowik.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fe36a0c8e0a5934f07135d77662c1b2c/zosoredabirajob.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845000a204e---18320663379.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40679f546e7c92fe16809ed0fa81a700/64538585302.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58da0d41e7---vexaraj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=middle+school+football+plays
    • 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_off0001c618.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C618 16792 bytes
font_01_sfnt_off0001de2a.bin
0f58a30cc7ef8e49a5805973c0997338fc5410e30a16ba954b4bfcb61e1469bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE2A 17880 bytes
font_02_sfnt_off00020d06.bin
ac2145c017e01bfc9c4b257a516fdf0326b1de60e4f2f625d3bd0326c1efb672
pdf-font-stream PDF embedded font (sfnt) at offset 0x20D06 10760 bytes