Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f4d7094e81c7d0…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 12:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10d437a34de272b80d2a1513809ff496 SHA-1: c75208c6b00170e2e62e6b5ce575ed02072ffa67 SHA-256: 85f4d7094e81c7d0641b9aa21298209342b1cebde1e094471f4517c8cdd9e53e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, with numerous URLs pointing to other PDF files hosted on various websites. Some of these URLs are associated with compromised CMS uploads, suggesting a pattern of distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/f4626bcd82685055e961e7f5ac6d251a/rabolo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tvdhvp2gc4pl42sln0gdlcpi8k/46547356340.pdf
    • http://mg001.cn/upload_fck/file/2021-5-27/20210527234854107197.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f16b1c611---58369325279.pdf
    • https://bursac.net/userfiles/file/5477057424.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/74352ff5bdad491ab0c09932f528a242/36932013233.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ji4li94egukp87gfqjcu03gfs0/kenuletoxagosovej.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d86b99bf---vugufebafolaxulorizagete.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/rezafabokowawusidez.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ro3b8lri58vgo3s2qvje7ret74/54310982450.pdf
    • http://phuocthuan.vn/images/pic/file/zoleburogivosukogar.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609883e2dbad9---73142556418.pdf
    • https://fajanav.com/aym_image/files/tuvejemusifamuzukuxamas.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8551340253be7b4583bdaa1405b9c0f0/24327610193.pdf
    • https://avgdesign.com/userfiles/file/veloxolasalupe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=albums+released+in+2018
    • 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_off0000e324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 16792 bytes
font_01_sfnt_off0000fb3b.bin
b26f7491e1b9b1cae80da936e0dc2411dc1c551c088a37243e7f8e4d3a509b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10916 bytes
font_02_sfnt_off00011482.bin
fc0ea08a1c419aa5dfeb359278879bceaee0f01c6786ed304f0df1e7ca2d29fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 17684 bytes

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