Malicious PDF — malware analysis report

Static analysis result for SHA-256 730ea595be4d887d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-04 13:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8671f218b70f9a7865369b2d7fc1f50b SHA-1: 348d52d099c668f0e4bf94267d33aacf20b7a423 SHA-256: 730ea595be4d887d42745171401d4916ef6e9f61e2bb71993f9eb1ec4e9fd1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://wangyiphk.com/userfiles/jaximijefaregutemi.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77dcf31826---37122417697.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a16932e---7052538287.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16091d66095b64---pisawunafanonabunobetes.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/52ddf4a289365b53a4c3d12569be4a8b/wezuxeda.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d236d60e---89389559231.pdf
    • http://andrelandberg.com/userfiles/file/timewovusoranuxobapodikot.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bcb4e8af1---70225113615.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tjtru4rfrraeeqcobii14tgd6b/bazowefatopolimoxise.pdf
    • http://bearings-home.com/userfiles/file/20445537315.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d5c8c88e---walevebizawuk.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ffb47c16b---71790378617.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ba29fdd1---mubodisafapi.pdf
    • https://ahreco.com/uploads/news_file/79379829766.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608019920b3ff---luwadazirafinoxilezirowew.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f985bfb51---37897376251.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a809d5c0d43---tepogewinutibesabikixinos.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817a696e824---xefumadumuza.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091916d83e79---41646083342.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaba2a4f95---83085103061.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sawezigefuvuw.pdf
    • http://lblussana.it/images/file/nosiripigez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=top+spinner+unblocked
    • 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_off0000fc0d.bin
751d868a988be454f743ac6305cde671bc98bd8b1c7409a73de30f9161611b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17524 bytes
font_01_sfnt_off000129fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 16792 bytes
font_02_sfnt_off00014211.bin
ec2654df813981569f0959b12c42844b88995230103d3e1af381e87b3ea2aa31
pdf-font-stream PDF embedded font (sfnt) at offset 0x14211 10544 bytes