Malicious PDF — malware analysis report

Static analysis result for SHA-256 526ee1a60f77750a…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 23:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4e3b5cd8ac3aa985813410ea0ec77b4 SHA-1: 1d8a875b31e2c4bc81907b1ee65c48411ebe9ed7 SHA-256: 526ee1a60f77750a0988fa5a4333c4e43b3e389bfebc0211493779a3769ba460
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=ellen+pompeo+catch+me+if+you+can
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/95bc51f130be66b24f2ddab5f05af5af/72381099708.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/16ec8077689e17ff312b59789778919e/88077827436.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d13ed54d---65317000939.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e0078ff3b2873a813ec40318fd4bf75/tozonixiterajiv.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2804db072---wujezezasugewekafuku.pdf
    • http://www.aportecnica.com/imagenes/editor/file/97132775104.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5491ad15---paluzorijanigigaxanu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9739eb62c---20095966298.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ee07fce---62903290314.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/05f40381fcf4f0f6af4183754d9a0f95/durolizeduta.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d67cc4d1a71c80ac024352e232a1d33b/29471165653.pdf
    • http://aite-materials.com/upfiles/file/67620995153.pdf
    • https://allmassage.net/upload/file/20210505010617.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ef84044e26ba13bf1539f040d7efce60/manonowebubatavana.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc482aa6be---9983746471.pdf
    • http://mamnonlittlesun.com/upload/files/pagikezo.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ce148802---78087364600.pdf
    • http://ecohost.ru/pics/images/file/64159449658.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/v4m0klmcgsi23p9cos4db4f91b/8334893403.pdf
    • http://i-daa-wl.de/userfiles/tibukogipoxoxagajupopor.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aa0e5698---vuxeligun.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba44679537b866555ef83f8cf8d70696/16423559180.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac2b5152a---32437696689.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d2f24a7c---titerakobofimegod.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dkfphsge6bamu6kjvnts7eao45/55894236728.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_off0000db66.bin
0e58c8098769fb62f8a19b427509adaf30d0a8b4b1e57a90b9d71b379128f6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 26168 bytes
font_01_sfnt_off0001142e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 16792 bytes
font_02_sfnt_off00012c45.bin
6bc2096f0ac03fdb18cdfd376e17102744768d68333359c446cc1178f7657561
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 10672 bytes