Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88a435a09a27cb6…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 17:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40e8436ab34edec18b68ec028531557a SHA-1: 1aa6d6d52cfa460eb94d802d6457434ed560a708 SHA-256: d88a435a09a27cb69469b595c75c206fda69ca78ba0f252b6aeab6bac1ec2f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially as part of a phishing campaign or to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c611908a29e---xirozezevaradabegigoso.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c53b3c7c---35165539162.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/23393845042.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sndddqe4h1verugkg1k3p428gl/3109784755.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20230e87---70657424997.pdfIn PDF document text
    • https://loctra.net/userfiles/file/32563055282.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4303d0d2ea3f82476015d3137aec18e6/21690091466.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wobamizofa.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gutijagegotofufafajenaze.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/begibafovobevuwapu.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/33166653929.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lamilazogofumelel.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/9223651546.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/sawefulevalakewufemoduru.pdfIn PDF document text
    • https://ocw.tw/uploads/files/xerepugidezofeg.pdfIn PDF document text
    • https://123natura.com/stockages/files/43566627008.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d35e1f36151b7fb060bdad7538885c54/70572251043.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b085e9ba13fd57f0c6d3b5b4a742b2ed/79189535748.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/176ed4b7e7b7e6cdaebf40ba51358ef3/43887837913.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suil3caod3roq6q86h2rbcthqs/dusume.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/93766874657.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b776bab956c---90600758361.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15726771213.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6e2d6355f6c45761c4876ef23db819d7/xawawobig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=timeline+of+ancient+romePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16748 bytes
SHA-256: 9ee3c594790ceb10af651db0f5279ae488df90f6acdbaadc2797078b1ffba361
font_02_sfnt_off00014b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B57 10292 bytes
SHA-256: 1c2402b57cd5a917f29493c78f9eab770f81fa3bc3d49d59a870fc333514a036

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