Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7153ca0faca845e…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 13:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd42d120223926e76f1697abbe88045 SHA-1: 17a4558fa499f24f728c56579a0c29c483dcd829 SHA-256: c7153ca0faca845eb8440ef55f74619bd851aac5f40d2edcad6ca1100fd7f16b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting it is used to distribute further malicious content or phish users. The presence of multiple links on disposable or potentially compromised hosting reinforces this assessment.

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9577fcca242cc2a6bea50a3c58d11cbd/79091875425.pdf
    • http://vce34.ru/attachments/file/19858870526.pdf
    • http://all-pass.com/folder/editor/file/sakaf.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cca87cfe---60423313748.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cd149885---zefarizupijum.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d235448ab38---32988861747.pdf
    • http://alnadaoil.com/userfiles/file/68625218868.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/68407342348.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/948a2562328a6460199cb40c0f77e904/94464822165.pdf
    • http://solartgaleria.hu/images/file/68972608339.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce339eb71c---8416603189.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/59c1c288f79efa9d7a19ef806a816811/kekudabobutew.pdf
    • http://poltinka.ru/userfiles/file/83301309273.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/8dfe44688ef506cb0415b924bb83c244/zawikizozoxukamuwijasepuv.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b92d188cb---30982727167.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7d4320470dae2deb778002254bc2cd54/divan.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/68d3ee0c2cd98a264d64c09b0634fbe7/lirigeselavudesitejex.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e3a16e2403274e71ec003efae9c5147d/56485379232.pdf
    • http://adams-gold.ru/archive/image/file/68411496842.pdf
    • http://kolaykanal.com/userfiles/files/15056394946.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/jatizeruxok.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/27625927397.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3d33c3ddd07a79331d737b1650a30cd7/matopirinizinu.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070574aa180c---35381801986.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=if+you+see+kay+tell+her+i+love+her
    • 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_off0000ea26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
font_01_sfnt_off0001023d.bin
a2bbdd7804defa09a71e24c86d764422c71e9f78148e979bbbd5c6a2d0641084
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10528 bytes
font_02_sfnt_off00011a72.bin
f7aa21589145890b971dad16cd00d8bc5f797c270475f454aa6a583866887d53
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 18400 bytes