Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f587d80a872aeb…

MALICIOUS

PDF

94.5 KB Created: 2021-07-05 23:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdb9e4cca3114f4c2f776615d0e165b9 SHA-1: 4c1016bab211be7511bc743dd3e30ee6c3fb73d1 SHA-256: 87f587d80a872aebdb3b8332eab7bbb8733d0ee28fce5677cd55238715e15bc1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aoc99981eesuq7r3lic2nj7ec5/norugeximut.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60982d9b1c---segox.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dca19cc0---taduruw.pdf
    • https://aashianarealty.com/file/fusixilaxenetedopomoxod.pdf
    • http://lg-palette.com/upload/files/29326638385.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f2f67bf0b1bfff8516e7777bac2ec0f/pelolufagulibokexobu.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3c87n30hjim87e0euuh8h90vvl/39532155758.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f445d7ad9---3478690378.pdf
    • https://petikdaun.com/contents//files/tanemimosudamibena.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kau3c1bhr39irg0vejtjofclo5/worulexexas.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2dc9a657ae65d62366091f4dab536aa8/ruwijatapiribegovebutege.pdf
    • https://ipic.vn/userfiles/file/51620759262.pdf
    • https://bawwabatrizq.com/userfiles/file/mijuvegetudugozaked.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908b2ad3733---xevaroxomofit.pdf
    • http://tantusmarina.com/UserFiles/file/talate.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8400d662655a156182030d20335b3fb6/zudevafifefusemif.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/fefemigikirudedakuz.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/uhq6tht1i694m2v2gh577fkhj4/5534076747.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4chpk0ri91pkp6o439hcfsj53d/fonawiworilitofapogajimu.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/54813252113.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5v8c622pu4jerutals9ju6qj0m/51547194924.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1sn30rqgfabdtgjpq30lvvv2md/dololasitimi.pdf
    • https://aplusadvance.com/naver_editor/data/file/91810666587.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a8122b423b2c3fc600d88eb16fedce91/91157239187.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=white+tiger+book+story
    • 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_off000110b9.bin
77a44125ed2860d8ad116d7743b4c0217154d4c1fa759d6f4caa03eec8418ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10416 bytes
font_01_sfnt_off00012881.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 16792 bytes
font_02_sfnt_off00014093.bin
5f79df4aa7d46685a9bc227f1274a28fdd844fbe097ae28f3d6e852e6fd41489
pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 17188 bytes