Malicious PDF — malware analysis report

Static analysis result for SHA-256 443d98a7d6376eee…

MALICIOUS

PDF

111.2 KB Created: 2021-07-03 17:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09c965ed5a7759fc41fe7008ef52a7f4 SHA-1: d4705bf59e94513076864cb6344643c3407e1944 SHA-256: 443d98a7d6376eee24a47995c2ce881c9ee5ce2c6b37c38078670a840ce9de2a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded URLs strongly indicate a malicious intent to redirect users to further compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fb1b899a---37149179604.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vbckgnp9p3jjqat4fd98ungk2d/81370540215.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd319136a7---27435796633.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/77310611504.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/45011624560.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098985695a13---81126569003.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sivuwap.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73374dfbe8---juwisutomiwurisofuz.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lepesidatin.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/nejig.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b078b25ffd0---46196786209.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/291be27eb6621d66166b035cb2a76fe8/gomipudufogodob.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xenenudebujume.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426ca28497---27097731984.pdfIn PDF document text
    • http://expresskaliski.info/file/24536412250.pdfIn PDF document text
    • http://quaint-house.com/vuwut.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f546291a---zokavarovonum.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mamuxefedewijujodipereb.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vq932h94um1gb12ka6vr914eob/49769458056.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ca79a3a4c688f0a7cd632bb4492141d0/76016084284.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/339442c54b66b40e574b636e3bd3064c/11669919317.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da705fc56---vutib.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0cb19b9d---bimimibedogeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+would+like+to+be+aPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 32408 bytes
SHA-256: abb6bc0f251358137879c8557e02d244a0fa38bd0daf64fe5c4980a512593d75
font_01_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 18428 bytes
SHA-256: 4fefe8569f5300025b2e8e1c8c504df02059cd36d6535570c5bbf5c5881d7db1
font_03_sfnt_off00018066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18066 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_04_sfnt_off00019753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19753 10240 bytes
SHA-256: 789f57e12309f20eeb853eb3b93aa4249b725bde9d4f8ba6c141d917a48e97c4

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